Sinorhizobium melilotiSinorhizobiumSymbiosisRoot Nodules, PlantNitrogen FixationMedicago sativaMedicago truncatulaSinorhizobium frediiBacterial ProteinsBacteriaPlant RootsFabaceaePlant Root NodulationRhizobiaceaeRhizobiumLeghemoglobinLotusMedicagoBradyrhizobiumMolecular Sequence DataSoybeansGene Expression Regulation, BacterialRhizobium leguminosarumFrankiaPlants, MedicinalGenes, BacterialDNA, BacterialPhylogenyRNA, Ribosomal, 16SPlant ProteinsPhaseolusAcaciaRheumatoid NoduleSequence Analysis, DNAGene Expression Regulation, PlantElaeagnaceaeMycorrhizaeGram-Negative BacteriaPolysaccharides, BacterialGram-Positive BacteriaMimosaAmino Acid SequenceBase SequenceDNA, RibosomalSoil MicrobiologyMutationRhizobium tropiciPeasPlantsTooth RootLupinusMultiple Pulmonary NodulesBacteria, AnaerobicGenome, BacterialNitrogenaseAlphaproteobacteriaNitrogenNitrogen IsotopesSequence Homology, Amino AcidPhenotypeNitrogen CompoundsGenetic Complementation TestRNA, BacterialMelilotusEscherichia coliMutagenesis, InsertionalAlnusNitratesNitrogen CycleCarbonNitrogen DioxideBlood Urea NitrogenCloning, MolecularGlutamate-Ammonia LigaseGenes, rRNAPlants, Genetically ModifiedSpecies SpecificityGenes, PlantAmmonium CompoundsLespedezaRhizobium etliSesbaniaPlasmidsSpinal Nerve RootsCulture Media