Sinorhizobium melilotiSymbiosisMedicago sativaSinorhizobiumMedicago truncatulaNitrogen FixationBacterial ProteinsSinorhizobium frediiMedicagoPlant Root NodulationGene Expression Regulation, BacterialChromosomesRoot Nodules, PlantChromosome MappingBacteriaRhizobiumGenes, BacterialMolecular Sequence DataRhizobiaceaePolysaccharides, BacterialPlant RootsDNA, BacterialChromosomes, BacterialRhizobium leguminosarumFabaceaeMelilotusMutationChromosome BandingLuteolinBase SequenceX ChromosomeSequence Analysis, DNAGenome, BacterialMutagenesis, Insertional