What bacterial strain is isolated in the healthy 10-day-old variety of maize with a high sugar content?
Elizabethkingia endophytica Elizabethkingia endophytica is a slightly yellow Gram-stain-negative rod-shaped bacterial strain isolated from the stem of healthy 10-day-old sweet corn ("Zea mays"). A comparison of the 16S rRNA gene sequence of the isolate showed 99.1, 97.8, and 97.4% similarity to the 16S rRNA gene sequences of the type strains of "Elizabethkingia anophelis", "Elizabethkingia meningoseptica" and "Elizabethkingia miricola", respectively. DNA-DNA hybridization indicated that the strain is representative of a new species.
Azotobacteraceae The family Azotobacteraceae contains aerobic diazotrophs with three genera, "Azomonas", "Azotobacter" and "Azorhizophilus" distinguished by the ability to form cysts. The family is also characterized by variable cell shape, the classic shape being ovoid, while many are pleomorphic. With an adequate supply of molybdenum, the Azotobacteraceae are able to fix at least 10 mg of molecular nitrogen per gram of carbohydrate consumed under aerobic conditions. Like most Pseudomonadaceae, the Azotobacteraceae are able to use a wide variety of carbon sources, including sucrose. Recent analysis of the unannotated genome of "Azotobacter vinelandii" has shown this bacterium is most appropriately grouped in the family Pseudomonadaceae. The original familial distinction was based on the ability to fix nitrogen, but a few Pseudomonadaceae have been found to fix nitrogen, as well. The relation is not surprising given the ability of many Azotobacteraceae to fluoresce due to the production of pyoverdine, a nonribosomal peptide siderophore typical of many Pseudomonadaceae.