Nitrogen fixation and transcriptome of a new diazotrophic Geomonas from paddy soils

The ability of species to fix nitrogen gas (N ) is an important metabolic feature for its application as a plant growth-promoting rhizobacterium. This research is of great importance as it provides the first comprehensive direct experimental evidence of nitrogen fixation by the genus in pure culture. We isolated a number of strains from paddy soils and determined that was present in these strains. This study demonstrated that these species harbored genes encoding nitrogenase, as do and in the same class of . We demonstrated N -dependent growth of and determined regulation of gene expression associated with nitrogen fixation. The research establishes and advances our understanding of nitrogen fixation in .