RhizobiumSoilBacteriaSoil MicrobiologyRhizobium leguminosarumRhizobium etliSoil PollutantsSinorhizobium melilotiNitrogen FixationGram-Negative BacteriaBacterial ProteinsDNA, BacterialRNA, Ribosomal, 16SMolecular Sequence DataGram-Positive BacteriaFabaceaeRhizobium tropiciPhylogenyGenes, BacterialDNA, RibosomalBacteria, AnaerobicSequence Analysis, DNARhizobiaceaeGene Expression Regulation, BacterialMedicago sativaRoot Nodules, PlantBiodegradation, EnvironmentalSinorhizobiumPlant RootsPlant Root NodulationEscherichia coliBacteria, AerobicPseudomonasRNA, BacterialSymbiosisPlants, MedicinalBacterial Physiological PhenomenaCulture MediaBase SequenceGenome, BacterialSpecies SpecificityBradyrhizobiumPlasmidsColony Count, MicrobialAmino Acid SequenceGenes, rRNAWater MicrobiologyAnti-Bacterial AgentsPseudomonas putidaMyxococcus xanthusPolysaccharides, BacterialPseudomonas fluorescensGram-Negative Aerobic BacteriaPhaseolusMutationAerobiosisCloning, MolecularBase CompositionGram-Negative Aerobic Rods and CocciBetaproteobacteriaCarbonGram-Negative Anaerobic BacteriaBacterial Typing TechniquesEcosystemPlantsNitrogenBacillus subtilisBacteriological TechniquesDNA Transposable ElementsBurkholderiaActinomycetalesAnaerobiosisSequence Homology, Amino AcidPolymerase Chain ReactionMedicago truncatulaOperonTreesSulfur-Reducing BacteriaAcetyleneNucleic Acid HybridizationSeawaterArthrobacterFatty AcidsHydrogen-Ion ConcentrationPhenotypeMesorhizobiumFungiGenetic Complementation TestGene Transfer, HorizontalOligochaetaBiofilmsProteobacteriaSequence Homology, Nucleic AcidLightningPseudomonas mendocinaTemperatureRhizosphereSoybeansBacterial AdhesionBacillus