Sinorhizobium melilotiMedicago sativaSymbiosisPolysaccharides, BacterialGene Expression Regulation, BacterialBacterial ProteinsRhizobiumNitrogen FixationGenes, BacterialMedicago truncatulaMedicagoSinorhizobiumRoot Nodules, PlantMolecular Sequence DataGenetic Complementation TestLuteolinPlant RootsDNA, BacterialPlasmidsDNA Transposable ElementsRhizobium leguminosarumMutationMelilotusMutagenesis, InsertionalBase Sequence