Inbred corn line PHTD5
FIELD OF THE INVENTION 
     This invention is in the field of corn breeding, specifically relating to an inbred corn line designated PHTD5. 
     BACKGROUND OF THE INVENTION 
     Plant Breeding 
     Field crops are bred through techniques that take advantage of the plant&#39;s method of pollination. A plant is self-pollinated if pollen from one flower is transferred to the same or another flower of the same plant. A plant is cross-pollinated if the pollen comes from a flower on a different plant. 
     Corn plants (Zea mays L.) can be bred by both self-pollination and cross-pollination techniques. Corn has separate male and female flowers on the same plant, located on the tassel and the ear, respectively. Natural pollination occurs in corn when wind blows pollen from the tassels to the silks that protrude from the tops of the incipient ears. 
     The development of a hybrid corn variety involves three steps: (1) the selection of plants from various germplasm pools; (2) the selfing of the selected plants for several generations to produce a series of inbred lines, which, although different from each other, breed true and are highly uniform; and (3) crossing the selected inbred lines with unrelated inbred lines to produce the hybrid progeny (F 1 ). During the inbreeding process in corn, the vigor of the lines decreases. Vigor is restored when two unrelated inbred lines are crossed to produce the hybrid progeny. An important consequence of the homozygosity and homogeneity of the inbred lines is that the hybrid between any two inbreds will always be the same. Once the inbreds that give a superior hybrid have been identified, the hybrid seed can be reproduced indefinitely as long as the homogeneity of the inbred parents is maintained. 
     The objective of commercial maize inbred line development programs is to develop new inbred lines that combine to produce high grain yields and superior agronomic performance in hybrid combination. The primary trait breeders seek is yield. However, other major agronomic traits are of importance in hybrid combination and have an impact on yield or otherwise provide superior performance in hybrid combinations. Such traits include percent grain moisture at harvest, relative maturity, resistance to stalk breakage, resistance to root lodging, grain quality, and disease and insect resistance. In addition the lines per se must have acceptable performance for parental traits such as seed yields, kernel sizes, pollen production, all of which affect the ability to provide parental lines in sufficient quantity and quality for hybridization. Traits have been shown to be under genetic control and many if not all of the traits are affected by multiple genes. Thus, to be selected as an inbred line, the inbred must be able to combine such that the desired traits are passed to the hybrid and also be able to satisfy production requirements as a parental line. 
     Pedigree Breeding 
     The pedigree method of breeding is the mostly widely used methodology for new inbred line development. 
     In general terms this procedure consists of crossing two inbred lines to produce the non-segregating F 1  generation, and self pollination of the F 1  generation to produce the F 2  generation that segregates for all factors for which the inbred parents differ. An example of this process is set forth below. Variations of this generalized pedigree method are used, but all these variations produce a segregating generation which contains a range of variation for the traits of interest. 
     EXAMPLE 1 
     Hypothetical Example of Pedigree Breeding Program 
     Consider a cross between two inbred lines that differ for alleles at five loci. 
     The parental genotypes are: 
     
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Parent 1                                                                  
       A     b     C    d   e   F/A   b   C   d    e   F                  
Parent 2                                                                  
       a     B     c    D   E   f/a   B   c   D    E   f                  
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     the F 1  from a cross between these two parents is: 
     
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F.sub.1                                                                   
     A     b      C   d    e   F/a   B   c    D   E   f                   
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     Selfing F 1  will produce an F 2  generation including the following genotypes: 
     
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A    B     c      D        E   f/a   b   C    d   e    F                  
A    B     c      D        e   f/a   b   C    d   E    F                  
A    B     c      D        e   f/a   b   C    d   e    F                  
                      .                                                   
                      .                                                   
                      .                                                   
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     The number of genotypes in the F 2  is 3 6  for six segregating loci (729) and will produce (2 6 )-2 possible new inbreds, (62 for six segregating loci). 
     Each inbred parent which is used in breeding crosses represents a unique combination of genes, and the combined effects of the genes define the performance of the inbred and its performance in hybrid combination. There is published evidence (Smith, O. S., J. S. C. Smith, S. L. Bowen, R. A. Tenborg and S. J. Wall, TAG 80:833-840 (1990)) that each of these lines are different and can be uniquely identified on the basis of genetically-controlled molecular markers. 
     It has been shown (Hallauer, Arnel R. and Miranda, J. B. Fo. Quantitative Genetics in Maize Breeding, Iowa State University Press, Ames Iowa (1981)) that most traits of economic value in maize are under the genetic control of multiple genetic loci, and that there are a large number of unique combinations of these genes present in elite maize germplasm. If not, genetic progress using elite inbred lines would no longer be possible. Studies by Duvick and Russell (Duvick, D. N. Maydica 37:69-79 (1992); Russell, W. A. Maydica XXIX:375-390 (1983)) have shown that over the last 50 years the rate of genetic progress in commercial hybrids has been between 1 and 2% per year. 
     The number of genes affecting the trait of primary economic importance in maize, grain yield, has been estimated to be in the range of 10-1000. Inbred lines which are used as parents for breeding crosses differ in the number and combination of these genes. These factors make the plant breeder&#39;s task more difficult. Compounding this is evidence that no one line contains the favorable allele at all loci, and that different alleles have different economic values depending on the genetic background and field environment in which the hybrid is grown. Fifty years of breeding experience shows that there are many genes affecting grain yield and each of these has a relatively small effect On this trait. The effects are small compared to breeders&#39; ability to measure grain yield differences in evaluation trials. Therefore, the parents of the breeding cross must differ at several of these loci so that the genetic differences in the progeny will be large enough that breeders can develop a line that increases the economic worth of its hybrids over that of hybrids made with either parent. 
     If the number of loci segregating in a cross between two inbred lines is n, the number of .unique genotypes in the F 2  generation is 3 n  (Example 2) and the number of unique inbred lines from this cross is {(2 n )-2}. Only a very limited number of these combinations are useful. Only about 1 in 10,000 of the progeny from F 2  &#39;s are commercially useful. 
     By way of example, if it is assumed that the number of segregating loci in F 2  is somewhere between 20 and 50, and that each parent is fixed for half the favorable alleles, it is then possible to calculate approximate probabilities of finding an inbred that has the favorable allele at {(n/2)+m} loci, where n/2 is the number of favorable alleles in each of the parents and m is the number of additional favorable alleles in the new inbred. See Example 2 below. The number m is assumed to be greater than three because each allele has so small an effect that evaluation techniques are not sensitive enough to detect differences due to three or less favorable alleles. The probabilities in Example 2 are on the order of 10 -5  or smaller and they are the probabilities that at least one genotype with (n/2)+m favorable alleles will exist. 
     To put this in perspective the number of plants grown on 60 million acres (approximate US corn acreage) at 25000 plants/acre is 1.5×10 12 . 
     EXAMPLE 2 
     Probability of Finding an Inbred With m of n Favorable Alleles 
     Assume each parent has n/2 of the favorable alleles and only 1/2 of the combinations of loci are economically useful. 
     
         ______________________________________                                    
no. of  no. favorable                                                     
                   no. additional Probability                             
segregating                                                               
        alleles in favorable alleles                                      
                                  that genotype                           
loci (n)                                                                  
        Parent (n/2)                                                      
                   in new inbred  occurs*                                 
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20      10         14             3 × 10.sup.-5                     
24      12         16             2 × 10.sup.-5                     
28      14         18             1 × 10.sup.-5                     
32      16         20             8 × 10.sup.-6                     
36      18         22             5 × 10.sup.-6                     
40      20         24             3 × 10.sup.-6                     
44      22         26             2 × 10.sup.-6                     
48      24         28             1 × 10.sup.-6                     
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 *Probability that a useful combination exists, does not include the      
 probability of identifying this combination if it does exist.            
 
    
     The possibility of having a usably high probability of being able to identify this genotype based on replicated field testing would be most likely smaller than this, and is a function of how large a population of genotypes is tested and how testing resources are allocated in the testing program. 
     At Pioneer Hi-Bred International, a typical corn research station has a staff of four, and 20 acres of breeding nursery. Those researchers plant those 20 acres with 25,000 nursery rows, 15,000 yield test plots in 10-15 yield test sites, and one or two disease-screening nurseries. Employing a temporary crew of 20 to 30 pollinators, the station makes about 65,000 hand pollinations per growing season. Thus, one of the largest plant breeding programs in the world does not have a sufficiently large breeding population to be able to rely upon &#34;playing the numbers&#34; to obtain successful research results. Nevertheless, Pioneer&#39;s breeders at each station produce from three to ten new inbreds which are proposed for commercial use each year. Over the 32 Pioneer research stations in North America, this amounts to from about 100 to 300 new inbreds proposed for use, and less than 50 and more commonly less than 30 of these inbreds that actually satisfy the performance criteria for commercial use. 
     This is a result of plant breeders using their skills, experience and intuitive ability to select inbreds having the necessary qualities. 
     SUMMARY OF THE INVENTION 
     According to the invention, there is provided a novel inbred corn line, designated PHTD5. This invention thus relates to the seeds of inbred corn line PHTD5, to the plants of inbred corn line PHTD5, and to methods for producing a corn plant produced by crossing the inbred line PHTD5 with itself or another corn line. This invention further relates to hybrid corn seeds and plants produced by crossing the inbred line PHTD5 with another corn line. 
     Definitions 
     In the description and examples that follow, a number of terms are used herein. In order to provide a clear and consistent understanding of the specification and claims, including the scope to be given such terms, the following definitions are provided. ABS is in absolute terms and % MN is percent of the mean for the experiments in which the inbred or hybrid was grown. 
     BAR PLT=BARREN PLANTS. The percent of plants per plot that were not barren (lack ears). 
     BRT STK=BRITTLE STALKS. This is a measure of the stalk breakage near the time of pollination, and is an indication of whether a hybrid or inbred would snap or break near the time of flowering under severe winds. Data are presented as percentage of plants that did not snap. 
     BU ACR=YIELD (BUSHELS/ACRE). Actual yield of the grain at harvest in bushels per acre adjusted to 15.5% moisture. 
     DRP EAR=DROPPED EARS. A measure of the number of dropped ears per plot and represents the percentage of plants that did not drop ears prior to harvest. 
     EAR HT=EAR HEIGHT. The ear height is a measure from the ground to the highest placed developed ear node attachment and is measured in inches. 
     EAR SZ=EAR SIZE. A 1 to 9 visual rating of ear size. The higher the rating the larger the ear size. 
     EST CNT=EARLY STAND COUNT. This is a measure of the stand establishment in the spring and represents the number of plants that emerge on a per plot basis for the inbred or hybrid. 
     GDU SHD=GDU TO SHED. The number of growing degree units (GDUs) or heat units required for an inbred line or hybrid to have approximately 50 percent of the plants shedding pollen and is measured from the time of planting. Growing degree units are calculated by the Barger Method, where the heat units for a 24-hour period are: ##EQU1## 
     The highest maximum temperature used is 86° F. and the lowest minimum temperature used is 50° F. For each inbred or hybrid it takes a certain number of GDUs to reach various stages of plant development. 
     GDU SLK=GDU TO SILK. The number of growing degree units required for an inbred line or hybrid to have approximately 50 percent of the plants with silk emergence from time of planting. Growing degree units are calculated by the Barger Method as given in GDU SHD definition. 
     GRN APP=GRAIN APPEARANCE. This is a 1 to 9 rating for the general appearance of the shelled grain as it is harvested based on such factors as the color of the harvested grain, any mold on the grain, and any cracked grain. High scores indicate good grain quality. 
     MST=HARVEST MOISTURE. The moisture is the actual percentage moisture of the grain at harvest. 
     PLT HT=PLANT HEIGHT. This is a measure of the height of the plant from the ground to the tip of the tassel in inches. 
     POL SC=POLLEN SCORE. A 1 to 9 visual rating indicating the amount of pollen shed. The higher the score the more pollen shed. 
     POL WT=POLLEN WEIGHT. This is calculated by dry weight of tassels collected as shedding commences minus dry weight from similar tassels harvested after shedding is complete. 
     It should be understood that the inbred can, through routine manipulation of cytoplasmic factors, be produced in a cytoplasmic male-sterile form which is otherwise phenotypically identical to the male-fertile form. 
     PRM=PREDICTED RM. This trait, predicted relative maturity (RM), is based on the harvest moisture of the grain. The relative maturity rating is based on a known set of checks and utilizes standard linear regression analyses and is referred to as the Comparative Relative Maturity Rating System which is similar to the Minnesota Relative Maturity Rating System. 
     RT LDG=ROOT LODGING. Root lodging is the percentage of plants that do not root lodge; plants that lean from the vertical axis at an approximately 30° angle or greater would be counted as root lodged. 
     SCT GRN=SCATTER GRAIN. A 1 to 9 visual rating indicating the amount of scatter grain (lack of pollination or kernel abortion) on the ear. The higher the score the less scatter grain. 
     SDG VGR=SEEDLING VIGOR. This is the visual rating (1 to 9) of the amount of vegetative growth after emergence at the seedling stage (approximately five leaves). A higher score indicates better vigor. 
     SEL IND=SELECTION INDEX. The selection index gives a single measure of the hybrid&#39;s worth based on information for up to five traits. A corn breeder may utilize his or her own set of traits for the selection index. One of the traits that is almost always included is yield. The selection index data presented in the tables represent the mean value averaged across testing stations. 
     STA GRN=STAY GREEN. Stay green is the measure of plant health near the time of black layer formation (physiological maturity). A high score indicates better late-season plant health. 
     STK CNT=NUMBER OF PLANTS. This is the final stand or number of plants per plot. 
     STK LDG=STALK LODGING. This is the percentage of plants that did not stalk lodge (stalk breakage) as measured by either natural lodging or pushing the stalks and determining the percentage of plants that break below the ear. 
     TAS BLS=TASSEL BLAST. A 1 to 9 visual rating was used to measure the degree of blasting (necrosis due to heat stress) of the tassel at time of flowering. A 1 would indicate a very high level of blasting at time of flowering, while a 9 would have no tassel blasting. 
     TAS SZ=TASSEL SIZE. A 1 to 9 visual rating was used to indicate the relative size of the tassel. The higher the rating the larger the tassel. 
     TAS WT=TASSEL WEIGHT. This is the average weight of a tassel (grams) just prior to pollen shed. 
     TEX EAR=EAR TEXTURE. A 1 to 9 visual rating was used to indicate the relative hardness (smoothness of crown) of mature grain. A 1 would be very soft (extreme dent) while a 9 would be very hard (flinty or very smooth crown). 
     TILLER=TILLERS. A count of the number of tillers per plot that could possibly shed pollen was taken. Data is given as percentage of tillers: number of tillers per plot divided by number of plants per plot. 
     TST WT=TEST WEIGHT (UNADJUSTED). The measure of the weight of the grain in pounds for a given volume (bushel). 
     TST WTA=TEST WEIGHT ADJUSTED. The measure of the weight of the grain in pounds for a given volume (bushel) adjusted for percent moisture. 
     YLD=YIELD. It is the same as BU ACR ABS. 
     YLD SC=YIELD SCORE. A 1 to 9 visual rating was used to give a relative rating for yield based on plot ear piles. The higher the rating the greater visual yield appearance. 
     MDM CPX=Maize Dwarf Mosaic Complex (MDMV=Maize Dwarf Mosaic Virus &amp; MCDV=Maize Chlorotic Dwarf Virus): Visual rating (1-9 score) where a &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. 
     SLF BLT=Southern Leaf Blight (Bipolaris maydis, Helminthosporium maydis): Visual rating (1-9 score) where a &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. 
     NLF BLT=Northern Leaf Blight (Exserohilum turcicum, H. turcicum): Visual rating (1-9 score) where a &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. 
     COM RST=Common Rust (Puccinia sorghi): Visual rating (1-9 score) where a &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. 
     GLF SPT=Gray Leaf Spot (Cercospora zeae-maydis): Visual rating (1-9 score) where a &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. 
     STW WLT=Stewart&#39;s Wilt (Erwinia stewartii): Visual rating (1-9 score) where a &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. 
     HD SMT=Head Smut (Sphacelotheca reiliana): Percentage of plants that did not have infection. 
     EAR MLD=General Ear Mold: Visual rating (1-9 score) where a &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. This is based on overall rating for ear mold of mature ears without determining specific mold organism, and may not be predictive for a specific ear mold. 
     ECB DPE=Dropped ears due to European Corn Borer (Ostrinia nubilalis): Percentage of plants that did not drop ears under second brood corn borer infestation. 
     ECB 2SC=European Corn Borer Second Brood (Ostrinia nubilalis): Visual rating (1-9 score) of post flowering damage due to infestation by European Corn Borer. A &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. 
     ECB 1LF=European Corn Borer First Brood (Ostrinia nubilalis): Visual rating (1-9 score) of pre-flowering leaf feeding by European Corn Borer. A &#34;1&#34; is very susceptible and a &#34;9&#34; is very resistant. 
     DETAILED DESCRIPTION OF INVENTION 
     PHTD5 has good yield over a wide range of environments. It also has good drydown for its maturity. 
     Inbred corn line PHTD5 is a yellow, dent corn inbred that provides an acceptable male or female parental line in crosses for producing first generation F1 corn hybrids. PHTD5 is widely adapted to the northern latitudes where corn is grown, including Europe. PHTD5 is high yielding with good drydown for its maturity (85 and 90 CRM) and has especially good female seed yields. It is above average for root lodging with reasonable resistance to leaf diseases. 
     The inbred has shown uniformity and stability within the limits of environmental influence for all the traits as described in the Variety Description Information (Table 1) that follows. Most of the data in the Variety Description information was collected at Johnston, Iowa. The inbred has been self-pollinated and ear-rowed a sufficient number of generations with careful attention paid to uniformity of plant type to ensure homozygosity and phenotypic stability. The line has been increased both by hand and in isolated fields with continued observation for uniformity. No variant traits have been observed or are expected in PHTD5. 
     Inbred corn line PHTD5, being substantially homozygous, can be reproduced by planting seeds of the line, growing the resulting corn plants under self-pollinating or sib-pollinating conditions with adequate isolation, and harvesting the resulting seed, using techniques familiar to the agricultural arts. 
     
                       TABLE 1                                                     
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VARIETY DESCRIPTION INFORMATION                                           
INBRED = PHTD5                                                            
Type: Dent   Region Best Adapted: North Central                           
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A.  Maturity: Average across maturity zones.                              
    Heat Unit Shed: 1230                                                  
    Heat Unit Silk: 1250                                                  
    No. Reps: 23                                                          
 ##STR1##                                                                 
    *If maximum is greater than 86 degrees fahrenheit, then 86            
    is used and if minimum is less than 50, then 50 is used.              
    Heat units accumulated daily and can not be less than 0.              
B.  Plant Characteristics:                                                
    Plant height (to tassel tip): 184 cm                                  
    Length of top ear internode: 12 cm                                    
    Number of ears per stalk: Slight two ear tendancy                     
    Ear height (to base of top ear): 92 cm                                
    Number of tillers: None                                               
    Cytoplasm type: Normal                                                
C.  Leaf:                                                                 
    Color: (B14) Dark Green                                               
    Angle from Stalk: 30-60 degrees                                       
    Marginal Waves: (WF9) Few                                             
    Number of Leaves (mature plants): 19                                  
    Sheath Pubescence: (W22) Light                                        
    Longitudinal Creases: (OH56A) Few                                     
    Length (Ear node leaf): 67 cm                                         
    Width (widest point, ear node leaf): 9 cm                             
D.  Tassel:                                                               
    Number lateral branches: 15                                           
    Branch Angle from central spike: 30-40 degrees                        
    Pollen Shed: Light based on Pollen Yield Test                         
    (88% of experiment means)                                             
    Peduncle Length (top leaf to basal branches): 12 cm                   
    Anther Color: Red                                                     
    Glume Color: Green                                                    
E.  Ear (Husked Ear Data Except When Stated Otherwise):                   
    Length: 13 cm                                                         
    Weight: 104 cm                                                        
    Mid-point Diameter: 41 mm                                             
    Silk Color: Salmon                                                    
    Husk Extension (harvest stage): Medium (barely covering ear)          
    Husk Leaf: Short (&lt;8 cm)                                              
    Taper of Ear: Average                                                 
    Position of Shank (dry husks): Upright                                
    Kernel Rows: Straight Indistinct Number = 16                          
    Husk Color (fresh): Light Green                                       
    Husk Color (dry): Buff                                                
    Shank Length: 13 cm                                                   
    Shank (No. of internodes): 8                                          
F.  Kernel (Dried):                                                       
    Size (from ear mid-point)                                             
Length:   11 mm                                                           
Width:     8 mm                                                           
Thick:     5 mm                                                           
    Shape Grade (% rounds): 40-60 (45% medium round based                 
    on Parent Test Data)                                                  
    Pericarp Color: Colorless                                             
    Aleurone Color: Homozygous Yellow                                     
    Endosperm Color: Yellow                                               
    Endosperm Type: Normal Starch                                         
    Gm Wt/100 Seeds (unsized): 28 gm                                      
G.  Cob:                                                                  
    Diameter at mid-point: 22 mm                                          
    Strength: Strong                                                      
    Color: Red                                                            
H.  Diseases:                                                             
    N. Leaf Blight (E. turcicum): Intermediate                            
    Common Rust (P. sorghi): Resistant                                    
    Stewart&#39;s Wilt (E. stewartii): Intermediate                           
    Common Smut (U. maydis): Highly Resistant                             
    Head Smut (S. reiliana): Intermediate                                 
    Fusarium Ear Mold (F. monilifirme): Highly Resistant                  
    Gibberella Ear Rot (G. zeae): Intermediate                            
I.  Insects:                                                              
    European Corn Borer-1 Leaf Damage (Pre-flowering):                    
    Susceptible                                                           
    European Corn Borer-2 (Post-flowering): Intermediate                  
    The above descriptions are based on a scale of 1-9, 1 being           
    highly susceptible, 9 being highly resistant.                         
    S (Susceptible): Would generally represent a score of 1-3.            
    I (Intermediate): Would generally represent a score of 4-5.           
    R (Resistant): Would generally represent a score of 6-7.              
    H (Highly Resistant): Would generally represent a score of            
    8-9. Highly resistant does not imply the inbred is immune.            
J.  Variety Most Closely Resembling:                                      
Character  Inbred                                                         
Maturity   PHR25                                                          
Usage      PHR25                                                          
______________________________________                                    
 PHR25 (PVP Certificate No. 8800002) is a Pioneer HiBred International,   
 Inc. proprietary inbred.                                                 
 Data for Items B, C, D, E, F, and G is based primarily on a maximum of tw
 reps from Johnson, Iowa grown in 1992, plus description information from 
 the maintaining station.                                                 
 
    
     ELECTROPHORESIS RESULTS 
     Isozyme Genotypes for PHTD5 
     Isozyme data were generated for inbred corn line PHTD5 according to the procedures described in Stuber, C. W., Wendel, J. F., Goodman, M. M., and Smith, J. S. C., &#34;Techniques and Scoring Procedures for Starch Gel Electrophoresis of Enzymes from Maize (Zea mays L.)&#34;, Technical Bulletin No. 286, North Carolina Agricultural Research Service, North Carolina State University, Raleigh, N.C. (1988). 
     The data in Table 2 compares PHTD5 with its parents, PHH93 and PHR25. 
     
                       TABLE 2                                                     
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ELECTROPHORESIS RESULTS FOR PHTD5                                         
AND ITS PARENTS PHH93 AND PHR25                                           
                 PARENTS                                                  
LOCI    PHTD5          PHH93   PHR25                                      
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ACP1    2              2       2                                          
ADH1    4              4       4                                          
CAT3    9              9       9                                          
DIA1    8              8       8                                          
GOT1    4              4       4                                          
GOT2    4              4       4                                          
GOT3    4              4       4                                          
IDH1    4              4       4                                          
IDH2    6              6       6                                          
MDH1    1              1       1                                          
MDH2    3.5            3.5     3.5                                        
MDH3    16             16      16                                         
MDH4    12             12      12                                         
MDH5    12             12      12                                         
MMM     4              4       4                                          
PGM1    9              9       9                                          
PGM2    4              4       4                                          
PGD1    3.8            3.8     3.8                                        
PGD2    5              5       5                                          
PHI1    4              4       4                                          
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     EXAMPLES 
     Inbred and Hybrid Performance of PHTD5 
     In the examples that follow, the traits and characteristics of inbred corn line PHTD5 are given as a line in comparison with other inbreds and in hybrid combination. The data collected on inbred corn line PHTD5 is presented for the key characteristics and traits. 
     PHTD5 is considered a &#34;direct replacement&#34; for PHR25, however, Table 3A shows PHTD5 has higher yield, grain harvest moisture and test weight compared to PHR25 and thus is markedly superior, as is the performance of its hybrids. (See below) PHTD5 is a shorter inbred with higher ear placement and flowers (GDU Shed and GDU Silk) later than PHR25. PHTD5 has better ear texture and grain appearance than PHR25. 
     Table 3B compares PHTD5 and PHFR8. PHTD5 has lower yield and test weight than PHFR8. PHTD5 is shorter with higher ear placement and flowers (GDU Shed and GDU Silk) earlier than PHFR8. 
     Table 3C shows PHTD5 has higher yield and grain harvest moisture but lower test weight than PHM81. PHTD5 is taller with higher ear placement and flowers (GDU Shed and GDU Silk) later than PHM81. PHTD5 has better staygreen than PHM81. 
     The data in Table 3D shows PHTD5 has lower yield and grain harvest moisture but higher test weight than PHP02. PHTD5 is a shorter inbred and flowers (GDU Shed and GDU Silk) earlier than PHP02. 
     Table 3E compares PHTD5 to PHG72. PHTD5 has lower yield than PHG72. PHTD5 flowers (GDU Shed and GDU Silk) earlier than PHG72. 
     Table 4A compares PHTD5 and PHR25 when both were crossed to the same inbred testers. The PHTD5 hybrids have higher yield than the PHR25 hybrids. The PHTD5 hybrids shed (GDU Shed) later than the PHR25 hybrids. The PHTD5 hybrids are slightly taller and have higher ear placement compared to the PHR25 hybrids. 
     Table 4B compares PHTD5 and PHFR8 when both were crossed to the same inbred testers. The PHTD5 hybrids have higher yield and lower grain harvest moisture than the PHFR8 hybrids. The PHTD5 hybrids shed (GDU Shed) slightly earlier than the PHFR8 hybrids. The PHTD5 hybrids have better seedling vigor and are shorter with lower ear placement compared to the PHFR8 hybrids. 
     Table 4C compares PHTD5 to PHP02 when both were crossed to the same inbred testers. The PHTD5 hybrids have higher yield, lower grain harvest moisture and higher test weight compared to the PHP02 hybrids. The PHTD5 hybrids shed (GDU Shed) earlier than the PHP02 hybrids. The PHTD5 hybrids have better grain appearance and seedling vigor plus a higher early stand count compared to the PHP02 hybrids. The PHTD5 hybrids are shorter with lower ear placement than the PHP02 hybrids. 
     Table 5A compares PHTD5 and PHP02 when both were crossed to the same inbred. The PHTD5 hybrid has higher yield, lower grain harvest moisture and higher test weight than the PHP02 hybrid. The PHTD5 hybrid is shorter with lower ear placement and sheds (GDU Shed) earlier than the PHP02 hybrid. 
     Table 5B compares PHTD5 to PHR25 when both were crossed to the same inbred. The PHTD5 hybrid has higher yield and test weight compared to the PHR25 hybrid. The PHTD5 hybrid has better seedling vigor and higher early stand count than the PHR25 hybrid. The PHTD5 hybrid is taller with higher ear placement and sheds (GDU Shed) later than the PHR25 hybrid. 
     Table 5C compares PHTD5 to PHR25 when both were crossed to the same inbred, an inbred different than in Table 5B. The PHTD5 hybrid is higher yielding than the PHR25 hybrid. The PHTD5 hybrid has better staygreen and better seedling vigor compared to the PHR25 hybrid. The hybrids have similar plant height but the PHTD5 hybrid has higher ear placement and sheds (GDU Shed) later than the PHR25 hybrid. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 compares the yield of PHTD5 and PHR25. PHTD5 and PHR25 have similar yield in low yield environments but PHTD5 has better yield in high yield environments. 
     FIG. 2 compares the yield of PHTD5 and PHFR8. PHTD5 and PHFR8 have similar yield in low yield environments. Both inbreds have above average yield but PHFR8 has higher yield in high yield environments compared to PHTD5. 
     FIG. 3 compares the yield of PHTD5 and PHM81. PHTD5 has above average yield whereas PHM81 has below average yield across all environments. PHTD5 has higher yield than PHM81 across all environments with the greatest differential in low yield environments. 
     FIG. 4 compares the yield of PHTD5 and PHP02. Both inbreds have above average yield but PHP02 is higher yielding across all environments than PHTD5. 
     
                                           TABLE 3A                                
__________________________________________________________________________
PAIRED INBRED COMPARISON DATA                                             
VARIETY #1-PHTD5                                                          
VARIETY #2-PHR25                                                          
            BU  BU  YLD      EAR BAR PLT EAR  SDG EST DRP TIL             
        VAR ACR ACR SC   MST SZ  PLT HT  HT   VGR CNT EAR LER             
DEPT    #   ABS %MN ABS  ABS ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   70.0                                                          
                111 6.1  18.6                                             
                             5.0 98.8                                     
                                     69.0                                 
                                         28.1 5.8 39.7                    
                                                      99.7                
                                                          1.5             
        2   63.5                                                          
                101 5.7  18.2                                             
                             4.8 98.0                                     
                                     73.0                                 
                                         26.3 4.8 38.8                    
                                                      99.8                
                                                          1.6             
        LOCS                                                              
            12  12  9    12  5   11  22  22   18  36  6   26              
        REPS                                                              
            38  38  9    38  5   19  37  36   29  83  14  44              
        DIFF                                                              
            6.5 10  0.4  0.4 0.2 0.8 4.0 1.8  1.0 0.9 0.2 0.1             
        PROB                                                              
            .051*                                                         
                0.79*                                                     
                    .272 .161                                             
                             .704                                         
                                 .403                                     
                                     .000#                                
                                         .060*                            
                                              .025+                       
                                                  .347                    
                                                      .363                
                                                          .933            
__________________________________________________________________________
            GDU GDU POL POL  POL TAS TAS TEX  TST GRN SCT STA             
        VAR SHD SLK WT  WT   SC  BLS SZ  EAR  WT  APP GRN GRN             
DEPT    #   ABS ABS ABS %MN  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   1205                                                          
                1213                                                      
                    106.3                                                 
                        87   5.4 8.4 5.5 3.5  58.6                        
                                                  5.7 8.2 3.0             
        2   1171                                                          
                1187                                                      
                    123.9                                                 
                        102  5.5 8.9 5.6 2.5  56.3                        
                                                  3.7 7.9 1.9             
        LOCS                                                              
            31  26  6   6    16  4   12  6    12  6   9   5               
        REPS                                                              
            44  33  12  12   23  7   12  6    38  13  9   11              
        DIFF                                                              
            34  26  17.7                                                  
                        15   0.1 0.5 0.1 1.0  2.3 2.0 0.3 1.1             
        PROB                                                              
            .000#                                                         
                .005#                                                     
                    .266                                                  
                        .286 .844                                         
                                 .391                                     
                                     .862                                 
                                         .041+                            
                                              .000#                       
                                                  .048+                   
                                                      .397                
                                                          .256            
__________________________________________________________________________
                                      STK RT  EAR STW ECB ECB             
                                  VAR LDG LDG MLD WLT 1LF 2SC             
                          DEPT    #   ABS ABS ABS ABS ABS ABS             
__________________________________________________________________________
                          TOTAL SUM                                       
                                  1   95.3                                
                                          95.2                            
                                              7.4 5.0 3.3 4.8             
                                  2   95.6                                
                                          84.9                            
                                              7.3 4.0 4.5 4.3             
                                  LOCS                                    
                                      9   4   7   1   4   2               
                                  REPS                                    
                                      27  10  7   1   4   3               
                                  DIFF                                    
                                      0.3 10.3                            
                                              0.1 1.0 1.3 0.5             
                                  PROB                                    
                                      .912                                
                                          .187                            
                                              .853    .194                
                                                          .500            
__________________________________________________________________________
 * = 10% SIG                                                              
 + = 5% SIG                                                               
 # = 1% SIG                                                               
 
    
     
                                           TABLE 3B                                
__________________________________________________________________________
PAIRED INBRED COMPARISON DATA                                             
VARIETY #1-PHTD5                                                          
VARIETY #2-PHFR8                                                          
            BU  BU  YLD      EAR BAR PLT EAR  SDG EST DRP TIL             
        VAR ACR ACR SC  MST  SZ  PLT HT  HT   VGR CNT EAR LER             
DEPT    #   ABS %MN ABS ABS  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   81.2                                                          
                116 6.0 18.8 5.0 97.3                                     
                                     69.7                                 
                                         28.8 5.5 44.7                    
                                                      99.7                
                                                          1.3             
        2   92.4                                                          
                131 6.2 20.3 5.4 98.6                                     
                                     71.1                                 
                                         27.5 5.2 46.1                    
                                                      99.9                
                                                          2.6             
        LOCS                                                              
            30  30  9   36   5   26  33  33   29  64  18  32              
        REPS                                                              
            62  62  9   68   5   31  51  51   39  120 38  50              
        DIFF                                                              
            11.3                                                          
                15  0.2 1.4  0.4 1.3 1.4 1.3  0.3 1.4 0.2 1.3             
        PROB                                                              
            .001#                                                         
                .001#                                                     
                    .665                                                  
                        .000#                                             
                             .477                                         
                                 .218                                     
                                     .019+                                
                                         .054*                            
                                              .279                        
                                                  .039+                   
                                                      .286                
                                                          .125            
__________________________________________________________________________
            GDU GDU POL POL  POL TAS TAS TEX  TST GRN SCT STA             
        VAR SHD SLK WT  WT   SC  BLS SZ  EAR  WT  APP GRN GRN             
DEPT    #   ABS ABS ABS %MN  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   1212                                                          
                1218                                                      
                    112.7                                                 
                        88   5.6 8.4 5.5 3.6  56.7                        
                                                  5.5 8.0 4.6             
        2   1229                                                          
                1228                                                      
                    113.3                                                 
                        91   5.9 8.9 5.6 4.4  56.7                        
                                                  6.0 8.3 5.9             
        LOCS                                                              
            43  33  9   9    20  5   14  7    30  18  9   13              
        REPS                                                              
            62  43  18  18   30  9   14  7    62  37  9   23              
        DIFF                                                              
            17  10  0.5 3    0.3 0.5 0.1 0.9  0.1 0.4 0.3 1.3             
        PROB                                                              
            .000#                                                         
                .031+                                                     
                    .962                                                  
                        .751 .239                                         
                                 .266                                     
                                     .635                                 
                                         .045+                            
                                              .684                        
                                                  .013+                   
                                                      .081*               
                                                          .000#           
__________________________________________________________________________
                                   STK RT  EAR NLF STW ECB ECB            
                               VAR LDG LDG MLD BLT WLT 1LF 2SC            
                       DEPT    #   ABS ABS ABS ABS ABS ABS ABS            
__________________________________________________________________________
                       TOTAL SUM                                          
                               1   95.3                                   
                                       97.1                               
                                           7.0 3.5 5.0 3.4 5.0            
                               2   97.0                                   
                                       89.6                               
                                           6.7 2.5 6.0 5.9 5.5            
                               LOCS                                       
                                   21  7   7   2   1   8   6              
                               REPS                                       
                                   44  16  7   2   1   10  10             
                               DIFF                                       
                                   0.3 1.0 1.0 2.5 0.5 2.5 0.5            
                               PROB                                       
                                   .090*                                  
                                       .101                               
                                           .715                           
                                               .500    .001#              
                                                           .229           
__________________________________________________________________________
 * = 10% SIG                                                              
 + = 5% SIG                                                               
 # = 1% SIG                                                               
 
    
     
                                           TABLE 3C                                
__________________________________________________________________________
PAIRED INBRED COMPARISON DATA                                             
VARIETY #1-PHTD5                                                          
VARIETY #2-PHM81                                                          
            BU  BU  YLD      EAR BAR PLT EAR  SDG EST DRP TIL             
        VAR ACR ACR SC  MST  SZ  PLT HT  HT   VGR CNT EAR LER             
DEPT    #   ABS %MN ABS ABS  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   81.5                                                          
                116 6.3 19.1 5.0 97.4                                     
                                     69.7                                 
                                         29.1 5.9 45.7                    
                                                      99.7                
                                                          1.4             
        2   64.1                                                          
                90  6.6 18.0 5.8 95.8                                     
                                     55.6                                 
                                         19.9 4.5 43.8                    
                                                      99.9                
                                                          1.9             
        LOCS                                                              
            27  27  10  33   5   21  31  31   22  43  17  19              
        REPS                                                              
            56  56  10  62   5   23  47  47   29  65  36  25              
        DIFF                                                              
            17.3                                                          
                26  0.3 1.0  0.8 1.7 14.1                                 
                                         9.2  1.3 1.9 0.3 0.5             
        PROB                                                              
            .000#                                                         
                .000#                                                     
                    .279                                                  
                        .000#                                             
                             .099*                                        
                                 .169                                     
                                     .000#                                
                                         .000#                            
                                              .000#                       
                                                  .019+                   
                                                      .167                
                                                          .453            
__________________________________________________________________________
            GDU GDU POL TAS  TAS TEX TST GRN  SCT STA STK RT              
        VAR SHD SLK WT  BLS  SZ  EAR WT  APP  GRN GRN LDG LDG             
DEPT    #   ABS ABS %MN ABS  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   1209                                                          
                1206                                                      
                    5.9 9.0  5.8 3.6 56.4                                 
                                         5.5  8.1 6.1 95.5                
                                                          97.1            
        2   1119                                                          
                1121                                                      
                    6.6 9.0  5.2 5.1 58.5                                 
                                         5.8  8.5 4.8 94.4                
                                                          98.5            
        LOCS                                                              
            29  20  10  1    13  7   27  18   10  7   17  7               
        REPS                                                              
            37  20  10  1    13  7   56  37   10  14  36  16              
        DIFF                                                              
            90  85  0.7 0.0  0.6 1.6 2.1 0.3  0.4 1.4 1.1 1.4             
        PROB                                                              
            .000#                                                         
                .000#                                                     
                    .257     .193                                         
                                 .005#                                    
                                     .000#                                
                                         .362 .309                        
                                                  .018+                   
                                                      .379                
                                                          .184            
__________________________________________________________________________
                                               EAR STW ECB ECB            
                                           VAR MLD WLT 1LF 2SC            
                                   DEPT    #   ABS ABS ABS ABS            
__________________________________________________________________________
                                   TOTAL SUM                              
                                           1   7.3 5.0 3.3 5.0            
                                           2   7.5 2.0 3.0 5.0            
                                           LOCS                           
                                               8   1   4   5              
                                           REPS                           
                                               8   1   4   9              
                                           DIFF                           
                                               0.3 3.0 0.3 0.0            
                                           PROB                           
                                               .790    .638               
                                                           .000#          
__________________________________________________________________________
 * = 10% SIG                                                              
 + = 5% SIG                                                               
 # = 1% SIG                                                               
 
    
     
                                           TABLE 3D                                
__________________________________________________________________________
PAIRED INBRED COMPARISONS DATA                                            
VARIETY #1-PHTD5                                                          
VARIETY #2-PHP02                                                          
            BU  BU  YLD      EAR BAR PLT EAR  SDG EST DRP TIL             
        VAR ACR ACR SC  MST  SZ  PLT HT  HT   VGR CNT EAR LER             
DEPT    #   ABS %MN ABS ABS  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   84.0                                                          
                118 6.2 19.1 5.0 98.1                                     
                                     69.2                                 
                                         28.7 5.5 41.6                    
                                                      99.7                
                                                          1.2             
        2   101.4                                                         
                143 7.6 23.2 7.6 99.6                                     
                                     74.7                                 
                                         28.9 4.4 39.0                    
                                                      99.7                
                                                          0.8             
        LOCS                                                              
            21  21  9   27   5   17  29  29   28  46  14  19              
        REPS                                                              
            42  42  9   50   5   20  43  43   37  86  28  23              
        DIFF                                                              
            17.4                                                          
                25  1.3 4.0  2.6 1.6 5.5 0.2  1.1 2.6 0.0 0.4             
        PROB                                                              
            .000#                                                         
                .000#                                                     
                    .016+                                                 
                        .000#                                             
                             .025+                                        
                                 .077*                                    
                                     .000#                                
                                         .814 .000#                       
                                                  .000#                   
                                                      .919                
                                                          .653            
__________________________________________________________________________
            GDU GDU POL TAS  TAS TEX TST GRN  SCT STA STK RT              
        VAR SHD SLK SC  BLS  SZ  EAR WT  APP  GRN GRN LDG LDG             
DEPT    #   ABS ABS ABS ABS  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   1206                                                          
                1209                                                      
                    5.8 9.0  5.4 3.3 56.5                                 
                                         5.3  8.2 4.6 95.8                
                                                          97.1            
        2   1250                                                          
                1276                                                      
                    5.6 9.0  6.2 3.2 53.7                                 
                                         5.4  8.3 6.0 96.1                
                                                          94.1            
        LOCS                                                              
            30  22  9   1    13  6   21  13   9   13  17  5               
        REPS                                                              
            37  22  9   1    13  6   42  25   9   23  34  10              
        DIFF                                                              
            44  67  0.2 0.0  0.8 0.2 0.8 0.0  0.1 1.4 0.3 3.0             
        PROB                                                              
            .000#                                                         
                .000#                                                     
                    .729     .065*                                        
                                 .793                                     
                                     .000#                                
                                         .928 .760                        
                                                  .002#                   
                                                      .803                
                                                          .410            
__________________________________________________________________________
                                           EAR NLF STW ECB ECB            
                                       VAR MLD BLT WLT 1LF 2SC            
                               DEPT    #   ABS ABS ABS ABS ABS            
__________________________________________________________________________
                               TOTAL SUM                                  
                                       1   7.6 3.5 5.0 3.5 5.0            
                                       2   8.0 4.0 5.0 6.3 5.6            
                                       LOCS                               
                                           7   2   1   6   6              
                                       REPS                               
                                           7   2   1   6   10             
                                       DIFF                               
                                           0.4 0.5 0.0 2.8 0.6            
                                       PROB                               
                                           .658                           
                                               .500    .038+              
                                                           .374           
__________________________________________________________________________
 * = 10% SIG                                                              
 + =  5% SIG                                                              
 # = 1% SIG                                                               
 
    
     
                                           TABLE 3E                                
__________________________________________________________________________
PAIRED INBRED COMPARISON DATA                                             
VARIETY #1-PHTD5                                                          
VARIETY #2-PHG72                                                          
            BU  BU  YLD      EAR BAR PLT EAR  SDG EST TIL GDU             
        VAR ACR ACR SC  MST  SZ  PLT HT  HT   VGR CNT LER SHD             
DEPT    #   ABS %MN ABS ABS  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   78.5                                                          
                113 5.8 16.5 5.0 99.2                                     
                                     72.5                                 
                                         29.8 5.6 40.2                    
                                                      1.8 1209            
        2   97.4                                                          
                141 6.7 16.8 5.5 99.1                                     
                                     73.2                                 
                                         29.2 5.4 42.3                    
                                                      5.6 1256            
        LOCS                                                              
            3   3   6   3    4   7   13  13   17  30  21  27              
        REPS                                                              
            6   6   6   6    4   10  15  15   20  42  32  37              
        DIFF                                                              
            18.9                                                          
                28  0.8 0.3  0.5 0.1 0.7 0.7  0.2 2.1 3.9 45              
        PROB                                                              
            .020+                                                         
                .034+                                                     
                    .259                                                  
                        .576 .604                                         
                                 .951                                     
                                     .634                                 
                                         .571 .590                        
                                                  .059*                   
                                                      .018+               
                                                          .000#           
__________________________________________________________________________
            GDU POL POL POL  TAS TAS TEX TST  GRN SCT STA STK             
        VAR SLK WT  WT  SC   BLS SZ  EAR WT   APP GRN GRN LDG             
DEPT    #   ABS ABS %MN ABS  ABS ABS ABS ABS  ABS ABS ABS ABS             
__________________________________________________________________________
TOTAL SUM                                                                 
        1   1224                                                          
                116.8                                                     
                    90  5.1  8.4 5.9 3.6 59.0 4.0 8.2 3.1 96.9            
        2   1296                                                          
                155.3                                                     
                    126 6.2  9.0 6.1 5.4 60.2 7.0 8.8 3.0 97.7            
        LOCS                                                              
            25  8   8   15   5   9   5   3    1   6   4   3               
        REPS                                                              
            34  16  16  24   9   9   5   6    1   6   7   6               
        DIFF                                                              
            72  38.5                                                      
                    35  1.1  0.6 0.2 1.8 1.2  3.0 0.7 0.1 0.8             
        PROB                                                              
            .000#                                                         
                .045+                                                     
                    .059*                                                 
                        .012+                                             
                             .284                                         
                                 .512                                     
                                     .037+                                
                                         .184     .175                    
                                                      .913                
                                                          .403            
__________________________________________________________________________
                                           EAR NLF STM ECB ECB            
                                       VAR MLD BLT WLT 1LF 2SC            
                               DEPT    #   ABS ABS ABS ABS ABS            
__________________________________________________________________________
                               TOTAL SUM                                  
                                       1   7.6 4.0 5.0 3.0 5.0            
                                       2   8.2 5.0 6.0 5.5 4.0            
                                       LOCS                               
                                           5   1   1   4   1              
                                       REPS                               
                                           5   1   1   4   1              
                                       DIFF                               
                                           0.6 1.0 1.0 2.5 1.0            
                                       PROB                               
                                           .591        .063*              
__________________________________________________________________________
 * = 10% SIG                                                              
 + = 5% SIG                                                               
 #  = 1% SIG                                                              
 
    
     
                                           TABLE 4A                                
__________________________________________________________________________
AVERAGE INBRED BY TESTER PERFORMANCE COMPARING PHR25 TO PHTD5             
CROSSED TO THE SAME INBRED TESTERS AND GROWN IN THE SAME                  
EXPERIMENTS. ALL VALUES ARE EXPRESSED AS PERCENT OF THE                   
EXPERIMENT MEAN EXCEPT PREDICTED RM, SELECTION INDEX, AND                 
YIELD (BU/ACR), WHICH ARE GIVEN IN ABSOLUTE UNITS.                        
                 SEL                                                      
                    BU       GDU PRM STK RT                               
       INBRED                                                             
             PRM IND                                                      
                    ACR                                                   
                       YLD                                                
                          MST                                             
                             SHD SHD LDG LDG                              
__________________________________________________________________________
TOTAL  REPLIC.                                                            
             44  43 44 44 44 48  13  55  4                                
MEAN WTS                                                                  
       PHR25 87  108                                                      
                    114                                                   
                       106                                                
                          90 99  86  102 91                               
MEAN WTS                                                                  
       PHTD5 88  111                                                      
                    117                                                   
                       109                                                
                          90 102 91  96  101                              
       DIFF.     2  3  4  0  3   4   5   11                               
__________________________________________________________________________
                TST GRN SDG EST                                           
                               STK                                        
                                  PLT                                     
                                     EAR DRP                              
          INBRED                                                          
                WTA APP VGR CNT                                           
                               CNT                                        
                                  HT HT  EAR                              
__________________________________________________________________________
TOTAL     REPLIC.                                                         
                44  37  55  92 112                                        
                                  52 52  32                               
MEAN WTS  PHR25 99  97  93  97 100                                        
                                  97 97  100                              
MEAN WTS  PHTD5 99  99  110 103                                           
                               100                                        
                                  99 106 100                              
          DIFF. 1   2   17  5  0  2  9   0                                
__________________________________________________________________________
 
    
     
                                           TABLE 4B                                
__________________________________________________________________________
AVERAGE INBRED BY TESTER PERFORMANCE COMPARING PHFR8 TO PHTD5             
CROSSED TO THE SAME INBRED TESTERS AND GROWN IN THE SAME                  
EXPERIMENTS. ALL VALUES ARE EXPRESSED AS PERCENT OF THE                   
EXPERIMENT MEAN EXCEPT PREDICTED RM, SELECTION INDEX, AND                 
YIELD (BU/ACR).                                                           
                 SEL                                                      
                    BU       GDU PRM STK RT  STA                          
       INBRED                                                             
             PRM IND                                                      
                    ACR                                                   
                       YLD                                                
                          MST                                             
                             SHD SHD LDG LDG GRN                          
__________________________________________________________________________
TOTAL  REPLIC.                                                            
             41  41 41 41 41 14  6   34  7   1                            
MEAN WTS                                                                  
       PHFR8 96  105                                                      
                    128                                                   
                       103                                                
                          105                                             
                             101 96  102 103 118                          
MEAN WTS                                                                  
       PHTD5 92  109                                                      
                    131                                                   
                       107                                                
                          94 99  92  97  104 67                           
       DIFF. 3   4  3  4  11 1   4   5   1   50                           
__________________________________________________________________________
                 TST GRN SDG EST                                          
                                STK                                       
                                   PLT                                    
                                      EAR DRP BRT                         
           INBRED                                                         
                 WTA APP VGR CNT                                          
                                CNT                                       
                                   HT HT  EAR STK                         
__________________________________________________________________________
TOTAL      REPLIC.                                                        
                 39  21  22  54 69 30 30  17  1                           
MEAN WTS   PHFR8 99  99  92  101                                          
                                101                                       
                                   102                                    
                                      103 100 100                         
MEAN WTS   PHTD5 98  99  112 101                                          
                                100                                       
                                   100                                    
                                      102 100 100                         
           DIFF. 1   1   19  0  0  2  1   0                               
__________________________________________________________________________
 
    
     
                                           TABLE 4C                                
__________________________________________________________________________
AVERAGE INBRED BY TESTER PERFORMANCE COMPARING PHP02 TO PHTD5             
CROSSED TO THE SAME INBRED TESTERS AND GROWN IN THE SAME                  
EXPERIMENTS. ALL VALUES ARE EXPRESSED AS PERCENT OF THE                   
EXPERIMENT MEAN EXCEPT PREDICTED RM, SELECTION INDEX, AND                 
YIELD (BU/ACR).                                                           
                 SEL                                                      
                    BU       GDU PRM STK TST                              
       INBRED                                                             
             PRM IND                                                      
                    ACR                                                   
                       YLD                                                
                          MSY                                             
                             SHD SHD LDG WTA                              
__________________________________________________________________________
TOTAL  REPLIC.                                                            
             19  18 19 19 19 9   5   17  19                               
MEAN WTS                                                                  
       PHP02 96  103                                                      
                    115                                                   
                       103                                                
                          111                                             
                             102 95  99  97                               
MEAN WTS                                                                  
       PHTD5 87  111                                                      
                    119                                                   
                       108                                                
                          84 98  91  100 99                               
       DIFF. 9   8  4  5  27 4   4   1   2                                
__________________________________________________________________________
                    GRN SDG EST                                           
                               STK                                        
                                  PLT                                     
                                     EAR DRP                              
              INBRED                                                      
                    APP VGR CNT                                           
                               CNT                                        
                                  HT HT  EAR                              
__________________________________________________________________________
       TOTAL  REPLIC.                                                     
                    14  14  18 23 14 14  8                                
       MEAN WTS                                                           
              PHP02 97  107 102                                           
                               100                                        
                                  103                                     
                                     110 100                              
       MEAN WTS                                                           
              PHTD5 101 109 104                                           
                               100                                        
                                  96 101 100                              
              DIFF. 4   2   2  1  7  9   0                                
__________________________________________________________________________
 
    
     
                                           TABLE 5A                                
__________________________________________________________________________
VARIETY #1-PHTD5 HYBRID                                                   
VARIETY #2-PHP02 HYBRID                                                   
                PRM BU  BU      STK TST GRN                               
        VAR     PRM ACR ACR MST LDG WTA APP                               
DEPT    #   PRM SHD ABS %MN %MN %MN %MN %MN                               
__________________________________________________________________________
TOTAL SUM                                                                 
        1   88  91  122.3                                                 
                        107 83  101 99  100                               
        2   96  95  117.7                                                 
                        102 111 98  97  98                                
        LOCS                                                              
            6   5   14  14  14  13  14  12                                
        REPS                                                              
            6   5   17  17  17  15  17  14                                
        DIFF                                                              
            9   4   4.6 5   28  2   2   1                                 
        PROB                                                              
            .000#                                                         
                .020+                                                     
                    .223                                                  
                        .254                                              
                            .000#                                         
                                .477                                      
                                    .015+                                 
                                        .871                              
__________________________________________________________________________
                SDG EST STK PLT EAR DRP GDU                               
            VAR VGR CNT CNT HT  HT  EAR SHD                               
DEPT        #   %MN %MN %MN %MN %MN %MN %MN                               
__________________________________________________________________________
TOTAL SUM   1   107 104 101 96  101 100 98                                
            2   105 102 100 103 111 100 101                               
            LOCS                                                          
                11  9   19  12  12  7   6                                 
            REPS                                                          
                14  13  23  14  14  8   9                                 
            DIFF                                                          
                2   2   1   7   10  0   3                                 
            PROB                                                          
                .757                                                      
                    .402                                                  
                        .226                                              
                            .000#                                         
                                .031+                                     
                                    .356                                  
                                        .008#                             
__________________________________________________________________________
 * = 10% SIG                                                              
 + = 5% SIG                                                               
 # = 1% SIG                                                               
 
    
     
                                           TABLE 5B                                
__________________________________________________________________________
VARIETY #1-PHTD5 HYBRID                                                   
VARIETY #2-PHR25 HYBRID                                                   
                PRM BU  BU      STK RT  TST                               
        VAR     PRM ACR ACR MST LDG LDG WTA                               
DEPT    #   PRM SHD ABS %MN %MN %MN %MN %MN                               
__________________________________________________________________________
TOTAL SUM                                                                 
        1   87  91  115.6                                                 
                        106 89  101 103 99                                
        2   87  87  112.8                                                 
                        103 89  103 100 98                                
        LOCS                                                              
            10  10  30  30  30  29  1   25                                
        REPS                                                              
            10  10  42  42  42  44  2   33                                
        DIFF                                                              
            0   5   2.8 3   1   2   3   1                                 
        PROB                                                              
            .753                                                          
                .000#                                                     
                    .236                                                  
                        .256                                              
                            .628                                          
                                .192    0.13+                             
__________________________________________________________________________
            GRN SDG EST STK PLT EAR DRP GDU                               
        VAR APP VGR CNT CNT HT  HT  EAR SHD                               
DEPT    #   %MN %MN %MN %MN %MN %MN %MN %MN                               
__________________________________________________________________________
TOTAL SUM                                                                 
        1   100 106 103 101 98  105 100 101                               
        2   97  87  93  100 95  96  100 98                                
        LOCS                                                              
            21  21  16  40  20  20  12  14                                
        REPS                                                              
            32  30  26  61  31  31  18  27                                
        DIFF                                                              
            4   19  10  0   3   9   0   4                                 
        PROB                                                              
            .318                                                          
                .000#                                                     
                    .000#                                                 
                        .273                                              
                            .000#                                         
                                .000#                                     
                                    .190                                  
                                        .000#                             
__________________________________________________________________________
 * = 10% SIG                                                              
 + = 5% SIG                                                               
 # = 1% SIG                                                               
 
    
     
                                           TABLE 5C                                
__________________________________________________________________________
VARIETY #1-PHTD5 HYBRID                                                   
VARIETY #2-PHR25 HYBRID                                                   
                PRM BU  BU      STK RT  STA TST                           
        VAR     PRM ACR ACR MST LDG LDG GRN WTA                           
DEPT    #   PRM SHD ABS %MN %MN %MN %MN %MN %MN                           
__________________________________________________________________________
TOTAL SUM                                                                 
        1   88  90  122.5                                                 
                        114 94  93  103 112 100                           
        2   88  86  116.0                                                 
                        108 93  100 91  83  99                            
        LOCS                                                              
            6   7   27  27  27  28  2   3   23                            
        REPS                                                              
            6   7   39  39  39  44  4   7   34                            
        DIFF                                                              
            0   4   6.5 6   1   7   12  29  0                             
        PROB                                                              
            .695                                                          
                .000#                                                     
                    .018+                                                 
                        .032+                                             
                            .502                                          
                                .002#                                     
                                    .332                                  
                                        .038+                             
                                            .350                          
__________________________________________________________________________
            GRN SDG EST STK PLT EAR DRP BRT GDU                           
        VAR APP VGR CNT CNT HT  HT  EAR STK SHD                           
DEPT    #   %MN %MN %MN %MN %MN %MN %MN %MN %MN                           
__________________________________________________________________________
TOTAL SUM                                                                 
        1   96  115 103 100 98  105 100 101 101                           
        2   91  100 101 100 97  94  100 101 98                            
        LOCS                                                              
            20  21  16  35  18  18  13  1   11                            
        REPS                                                              
            32  34  28  55  28  28  24  2   20                            
        PROB                                                              
            .251                                                          
                .003#                                                     
                    .150                                                  
                        .747                                              
                            .314                                          
                                .000#                                     
                                    .187    .000#                         
__________________________________________________________________________
 * = 10% SIG                                                              
 + = 5% SIG                                                               
 # = 1% SIG                                                               
 
    
    
    
     Industrial Applicability 
     The foregoing is set forth by way of example and is not intended to limit the scope of the invention. 
     This invention also is directed to methods for producing a corn plant by crossing a first parent corn plant with a second parent corn plant wherein the first or second parent corn plant is an inbred corn plant from the line PHTD5. Further, both first and second parent corn plants can come from the inbred corn line PHTD5. Thus, any such methods using the inbred corn line PHTD5 are part of this invention: selfing, backcrosses, hybrid production, crosses to populations, and the like. It also would include more unconventional methods of combining the inbred with another such as using various culturing techniques known to those skilled in the art. All plants produced using inbred corn line PHTD5 as a parent are within the scope of this invention. Advantageously, the inbred corn line is used in crosses with other, different, corn inbreds to produce first generation (F 1 ) corn hybrid seeds and plants with superior characteristics. 
     Corn plants (Zea mays L.) can be bred by both self-pollination and cross-pollination techniques. Corn has male flowers, located on the tassel, and female flowers, located on the ear, on the same plant. Natural pollination occurs in corn when wind blows pollen from the tassels to the silks that protrude from the tops of the incipient ears. Backcrossing can be used to transfer monogenic traits from one line to another. This can be accomplished for example by first crossing a superior inbred (A) (recurrent parent) to a donor inbred (non-recurrent parent), which carries the appropriate gene(s) for the trait in question. The progeny of this cross is then mated back to the superior recurrent parent (A) followed by selection in the resultant progeny for the desired trait to be transferred from the non-recurrent parent. After five or more backcross generations with selection for the desired trait, the progeny will be heterozygous for loci controlling the characteristic being transferred, but will be like the superior parent for most or almost all other genes. The last backcross generation would be selfed to give pure breeding progeny for the gene(s) being transferred. 
     Hybrid corn seed is produced by planting male and female parental lines in sufficient proximity to permit pollination of the female line by the male line (&#34;pollinating proximity&#34;). To assure genetic uniformity and avoid self-pollination, steps are taken to prevent pollen formation by the plants of the parental line chosen to serve as the female. This is most commonly done by manual detasseling. Alternate strips of the parental lines of corn are planted in a field, and the pollen-bearing tassels are physically removed from the female plants, either by hand or by machine. Providing that there is sufficient isolation from other sources of corn pollen, the ears of the female plants will be fertilized only by pollen from the male plants, and the resulting seed is therefore hybrid and will form hybrid plants. In a single-cross hybrid, both parents are inbred lines. In a double-cross hybrid, both parents are the F 1  offspring of a cross of two inbred lines. In a three-way cross, one of the parents is an inbred line and the other parent is an F 1  hybrid. Each cross is made in the manner described herein. 
     Unfortunately, the manual detasseling process is not entirely reliable. Occasionally a female plant will be blown over by a storm and escape detasseling. Or, a detasseler will not completely remove the tassel of the plant. In either event, the female plant will successfully shed pollen and some female plants will be self-pollinated. This will result in seed of the female inbred being harvested along with the hybrid seed which is normally produced. 
     Alternatively, the female inbred can be mechanically detasseled. Mechanical detasseling is approximately as reliable as manual detasseling, but is faster and less costly. However, most detasseling machines produce more damage to the plants than manual detasseling. 
     The laborious detasseling process can be avoided by using cytoplasmic male-sterile (CMS) inbreds. Plants of a CMS inbred are male sterile (do not form pollen) as a result of cytoplasmic factors resulting from the cytoplasmic, as distinguished from the nuclear, genome. Thus, this characteristic is inherited exclusively through the female parent, since the female parent provides the cytoplasm of the fertilized seed. CMS plants are fertilized with pollen from another inbred that is not male-sterile. Pollen from the male parent may or may not contribute genes that make the hybrid plants male-fertile. Usually seed from detasseled normal maize and CMS-produced seed of the same hybrid must be blended to insure that adequate pollen loads are available for fertilization when the hybrid plants are grown. 
     There can be other drawbacks to CMS. One is an historically observed association of a specific variant of CMS with susceptibility to certain crop diseases. This problem has led to widespread abandonment of use of that CMS variant in producing hybrid maize. In addition, CMS sometimes has a negative association with agronomic performance, particularly in the areas of stalk quality, early seedling vigor, and yield. Finally, CMS sometimes exhibits the potential for breakdown of sterility in certain environments, rendering CMS lines unreliable for hybrid seed production. 
     Another form of sterility, genic male sterility, is disclosed in U.S. Pat. Nos. 4,654,465 and 4,727,219 to Brar et al. However, this form of genetic male sterility requires maintenance of multiple mutant genes at separate locations within the genome and requires a complex marker system to track the genes and make use of the system convenient. 
     Another form of male sterility is imparted in a manner by which expression of a transgene produces a &#34;pollen-toxic&#34; compound which blocks pollen formation in some manner. 
     Still another form of genetic male sterility uses an inducible promoter to regulate expression of a gene which is known to be critical in microsporogenesis, i.e., the production of pollen. The selected gene is cloned, its native promoter removed, and the modified gene is inserted into an expression sequence with an inducible promoter responsive to external control. Preferably, the promoter is one which responds to application of a specific non-phytotoxic chemical to the plant. 
     Using transformation and gene substitution, the &#34;critical&#34; gene is deleted from the genome of the plant and replaced by the genetically-engineered gene incorporated into the expression sequence with the inducible promoter. In this method, the inducible promoter is used to induce fertility, not sterility. The selected gene&#39;s promoter sequences are removed so that the gene is not transcribed and the plant is male sterile. When it is desired to increase the male-sterile plant, male fertility is restored by inducing expression of the critical gene with a specific non-phytotoxic chemical. Any of the foregoing methods and combinations thereof can be used to prevent pollen formation by the female parent of the hybrid. 
     As used herein, the term plant includes plant cells, plant protoplasts, plant cell tissue cultures from which corn plants can be regenerated, plant calli, plant clumps, and plant cells that are intact in plants or parts of plants, such as embryos, pollen, flowers, kernels, ears, cobs, leaves, husks, stalks, roots, root tips, anthers, silks, and the like. 
     Duncan, Williams, Zehr, and Widholm, Planta, (1985) 165:322-332 reflects that 97% of the plants cultured which produced callus were capable of plant regeneration. Subsequent experiments with both inbreds and hybrids produced 91% regenerable callus which produced plants. In a further study in 1988, Songstad, Duncan &amp; Widholm in Plant Cell Reports (1988), 7:262-265 reports several media additions which enhance regenerability of callus of two inbred lines. Other published reports also indicated that &#34;nontraditional&#34; tissues are capable of producing somatic embryogenesis and plant regeneration. K. P. Rao, et al., Maize Genetics Cooperation Newsletter, 60:64-65 (1986), refers to somatic embryogenesis from glume callus cultures and B. V. Conger, et al., Plant Cell Reports, 6:345-347 (1987) indicates somatic embryogenesis from the tissue cultures of maize leaf segments. Thus, it is clear from the literature that the state of the art is such that these methods of obtaining plants are, and were, &#34;conventional&#34; in the sense that they are routinely used and have a very high rate of success. 
     Tissue culture of corn is described in European Patent Application, publication 160,390, incorporated herein by reference. Corn tissue culture procedures are also described in Green and Rhodes, &#34;Plant Regeneration in Tissue Culture of Maize,&#34; Maize for Biological Research (Plant Molecular Biology Association, Charlottesville, Va. 1982, at 367-372) and in Duncan, et al., &#34;The Production of Callus Capable of Plant Regeneration from Immature Embryos of Numerous Zea Mays Genotypes,&#34; 165 Planta 322-332 (1985). Thus, another aspect of this invention is to provide cells which upon growth and differentiation produce corn plants having the physiological and morphological characteristics of the inbred line PHTD5. 
     Corn is used as human food, livestock feed, and as raw material in industry. The food uses of corn, in addition to human consumption of corn kernels, include both products of dry- and wet-milling industries. The principal products of corn dry milling are grits, meal and flour. The corn wet-milling industry can provide corn starch, corn syrups, and dextrose for food use. Corn oil is recovered from corn germ, which is a by-product of both dry- and wet-milling industries. 
     Corn, including both grain and non-grain portions of the plant, is also used extensively as livestock feed, primarily for beef cattle, dairy cattle, hogs, and poultry. 
     Industrial uses of corn are mainly from corn starch in the wet-milling industry and corn flour in the dry-milling industry. The industrial applications of corn starch and flour are based on functional properties, such as viscosity, film formation, adhesive properties, and ability to suspend particles. The corn starch and flour have application in the paper and textile industries. Other industrial uses include applications in adhesives, building materials, foundry binders, laundry starches, explosives, oil-well muds, and other mining applications. 
     Plant parts other than the grain of corn are also used in industry. Stalks and husks are made into paper and wallboard and cobs are used for fuel and to make charcoal. 
     The seed of inbred corn line PHTD5, the plant produced from the inbred seed, the hybrid corn plant produced from the crossing of the inbred, hybrid seed, and various parts of the hybrid corn plant can be utilized for human food, livestock feed, and as a raw material in industry. 
     Although the foregoing invention has been described in some detail by way of illustration and example for the purposes of clarity and understanding, it will be obvious that certain changes and modifications may be practiced within the scope of the invention, as limited only by the scope of the appended claims. 
     Deposits 
     Applicant has made a deposit of at least 2500 seeds of Inbred Corn Line PHTD5 with the American Type Culture Collection (ATCC), Rockville, Md. 20852 USA, ATCC Accession No. 97373. The seeds deposited with the ATCC on Dec. 8, 1995 were taken from the deposit maintained by Pioneer Hi-Bred International, Inc., 700 Capital Square, 400 Locust Street, Des Moines, Iowa 50309-2340 since prior to the filing date of this application. This deposit of the Inbred Corn Line PHTD5 will be maintained in the ATCC depository, which is a public depository, for a period of 30 years, or 5 years after the most recent request, or for the effective life of the patent, whichever is longer, and will be replaced if it becomes nonviable during that period. Additionally, Applicant has satisfied all the requirements of 37 C.F.R. ÅÅ1.801-1.809, including providing an indication of the viability of the sample. Applicant imposes no restrictions on the availability of the deposited material from the ATCC; however, Applicant has no authority to waive any restrictions imposed by law on the transfer of biological material or its transportation in commerce. Inbred Corn Line PHTD5 is also a United States Protected Variety under Plant Variety Protection Certificate No. 9400095. Applicant does not waive any infringement of rights granted under this patent or the PVP Certificate.