Sinorhizobium melilotiSymbiosisMedicago sativaSinorhizobiumMedicago truncatulaNitrogen FixationBacterial ProteinsBacteriaSinorhizobium frediiMedicagoPlant Root NodulationGene Expression Regulation, BacterialRoot Nodules, PlantGenes, BacterialRhizobiumMolecular Sequence DataPolysaccharides, BacterialRhizobiaceaePlant RootsDNA, BacterialSequence Analysis, DNAGram-Negative BacteriaRhizobium leguminosarumFabaceaeGenome, BacterialGram-Positive BacteriaRNA, Ribosomal, 16SMelilotusMutationLuteolinPhylogenyMutagenesis, InsertionalEscherichia coliGenetic Complementation TestBase SequencePlasmidsAmino Acid SequenceBacteria, Anaerobic