Leaf Anatomical Characteristics in Relation to Grain Yield of Wheat ( Triticum aestivum L.) Cultivars
An experiment was carried out to study the variability of leaf anatomical characters of wheat ( Triticum aestivum L.) cultivars and their association with grain yields. Results indicated that in most of the cases cultivar differences were significant. In respect of 6th leaf anatomical characters, simple correlation coefficients indicated that most of the leaf anatomical traits had significant negative relation with grain yield whereas in respect of flag leaf anatomical traits, only the association between radial dimension of big xylem vessel and grain yield was significantly negative and the correlation between number of veins and grain yield was significantly positive. Key words: Leaf anatomy, wheat, yield, correlation Â  doi: 10.3329/jbs.v15i0.2156 Â  J. bio-sci. 15: 153-158, 2007
COMPARISON OF FOLIAR ANATOMY OF TEN BREAD WHEAT ( TRITICUM , POACEAE ) AND TEN BARLEY ( HORDEUM , POACEAE ) CULTIVARS
The aim of this study is to determine anatomical differences and classification of leaf and leaf cell characteristics (cuticle thickness, upper epidermis thickness, lower epidermis thickness, mesophyll thickness, parenchyma thickness and leaf thickness) between 10 bread wheat cultivars (Triticum aestivum L.) and 10 barley cultivars (Hordeum vulgare L.). Classification of leaf characteristics in bread wheat and barley cultivars and relationship between leaf characteristics are made by principal component and correlation analyses. Highest thickness belongs to W8 Müfitbey cultivar in mesophyll and lower epidermis and W1 Sönmez 01 cultivar have the lowest thickness of upper epidermis in bread wheat. In Barley, B1 Ince cultivar has highest leaf thickness mesophyll and parenchyma; lowest thickness of cuticle is included B7 Cumhuriyet 50 cultivar. All other cultivars have homogenous contents of leaf characteristics.
EFFECT OF LIGHT INTENSITY DURING GROWTH ON LEAF ANATOMY AND SUBSEQUENT LIGHT‐SATURATED PHOTOSYNTHESIS AMONG CONTRASTING LOLIUM GENOTYPES
Summary 
The effect of light intensity during leaf formation on subsequent light-saturated photosynthesis and its relation to mesophyll and stomatal characteristics, was examined among ten contrasting Lolium genotypes. Photosynthetic activity was recorded at three CO2 concentrations. At approximately 300 ppm CO2 and above, plants of the same mesophyll cell size grown in strong light (0.130 cal/cm2/min) of radiation in the spectral region 400–720 mμ. (1800 ft-candles) had faster rates of photosynthesis than those grown in relatively weak light (0.021 or 0.056 cal/cm2/ min). At the lowest CO2 concentration there was no effect on photosynthesis of the light intensity at which the plants were grown. The effect of light intensity was not associated with any change in mesophyll structure, but plants grown in weaker light (0.056 cal/cm2/min) had much smaller stomata than those grown in stronger light (0.130 cal/cm2/min). A slight increase in stomatal frequency at the low compared with the high light intensity did not compensate for the reduced stomatal length in terms of total pore space. Differences in apparent photosynthesis in any one light intensity, and between plants from all light intensities at the lowest CO2 concentration, were usually correlated negatively with mesophyll cell size. Effects of the light intensity at which plants were grown on subsequent photosynthesis could be explained in terms of changes in stomatal size.