AzospirillumAzospirillum brasilenseNitrogen FixationAzospirillum lipoferumGram-Negative Aerobic BacteriaNitrogenaseGlutamate SynthaseFlocculationAgricultural InoculantsPII Nitrogen Regulatory ProteinsDinitrogenase ReductaseSpirillumPlant RootsFuel OilsHydroxybutyratesSoil MicrobiologyRhodospirillaceaePolyestersGenes, BacterialTriticumPhloroglucinolDNA, BacterialAcetyleneAmmoniaGene Expression Regulation, BacterialMolecular Sequence DataRNA, Ribosomal, 16SAtriplexHerbaspirillumBacterial ProteinsPhylogeny