title: [Dynamics of diazotrophic bacteria number in the root zone of wheat Vrn lines isogenic by genes].
abstract: The number of diazotrophic bacteria and nitrogenase activity in the root zone of isogenic monogene-dominant Vrn lines were measured in the field experiments throughout their vegetation from tillering to heading. The total number of diazotrophic bacteria and nitrogenase activity in the root zone of these lines during this period were increased irrespective of their genotypes. The above indices of the winter cultivar (Vrn loci bottom recessive) were lower than those of the spring lines--Vrn-A1, Vrn-B1 and Vrn-D1. Plants of Vrn-B1 line have the lowest indices among the spring lines with the exception of some indices. This line plants flowered later than those of Vrn-A1 and Vrn-D1 lines. We hypothesized the differences between plants of these lines as to nitrogen fixation activity and the number of diazotrophic bacteria are mediately determined by Vrn loci through their effects on metabolism intensity and assimilate reflux in the form of root exudates, therefore the total number of diazotrophic bacteria and nitrogenase activity increases.
authors.forename: A M
authors.initials: AM
authors.lastname: Samoĭlov
authors.forename: V V
authors.initials: VV
authors.lastname: Zhmurko
mesh_terms: D000483:Alleles; D016949:Azospirillum / Q000254:growth & development*; D001395:Azotobacter / Q000254:growth & development*; D058491:Bacterial Load; D001426:Bacterial Proteins / Q000378:metabolism; D035264:Flowers / Q000235:genetics; D017343:Genes, Plant; D005808:Genes, Recessive; D056426:Genetic Loci; D005838:Genotype; D018525:Germination / Q000502:physiology; D009586:Nitrogen Fixation / Q000502:physiology; D009591:Nitrogenase / Q000378:metabolism; D018517:Plant Roots / Q000235:genetics / Q000382:microbiology*; D030821:Plants, Genetically Modified / Q000382:microbiology; D012621:Seasons; D013559:Symbiosis / Q000235:genetics*; D014908:Triticum / Q000235:genetics / Q000382:microbiology*
chemical_list: D001426:Bacterial Proteins; D009591:Nitrogenase