Sinorhizobium melilotiSinorhizobiumSymbiosisPachyrhizusBradyrhizobiumMimosaMedicago sativaNitrogen FixationMedicago truncatulaBacteriaSinorhizobium frediiRhizobiumBacterial ProteinsRoot Nodules, PlantGram-Negative BacteriaPlant Root NodulationGram-Positive BacteriaMolecular Sequence DataRhizobiaceaeGene Expression Regulation, BacterialMedicagoBacteria, AnaerobicDNA, BacterialGenes, BacterialRNA, Ribosomal, 16SFabaceaePlant RootsPhylogenySequence Analysis, DNARheumatoid NoduleBacteria, AerobicEscherichia coliDNA, RibosomalPolysaccharides, BacterialSoil MicrobiologyGenome, BacterialRhizobium leguminosarumBase SequenceRNA, BacterialAmino Acid SequenceMutationCulture MediaMultiple Pulmonary NodulesWater MicrobiologySoybeansNitrogen IsotopesNitrogen CompoundsCarbonSpecies SpecificityMelilotusBacterial Physiological PhenomenaNitrogen CycleGram-Negative Aerobic BacteriaGenes, rRNAGram-Negative Anaerobic BacteriaMutagenesis, InsertionalAnti-Bacterial AgentsNitrogen DioxidePlasmidsBlood Urea NitrogenSeawaterGenetic Complementation TestPhenotypeBase CompositionSequence Homology, Amino AcidOperonProteobacteriaSesbaniaCloning, MolecularColony Count, MicrobialSulfur-Reducing BacteriaAnaerobiosisPII Nitrogen Regulatory Proteins