BradyrhizobiumRhizobiaceaeSymbiosisNitrogen FixationSoybeansRoot Nodules, PlantFabaceaePlant Root NodulationRhizobiumPhylogenyMolecular Sequence DataGenes, BacterialRNA, Ribosomal, 16SDNA, BacterialAcaciaBacterial ProteinsSequence Analysis, DNAPlant RootsSinorhizobiumAphidsGammaproteobacteriaHeteropteraDNA, RibosomalGene Expression Regulation, BacterialLespedezaPachyrhizusAlphaproteobacteriaDNA, Ribosomal SpacerDinoflagellidaHydrogenase