sphingomonas azotifigens sphingomonas azotifigens sphingomonas azotifigens is a nitrogen-fixing bacteria from the genus of sphingomonas which has been isolated from the root of a rice plant (oryza sativa) in mishima in japan. sphingomonas azotifigens scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: sphingomonadales family: sphingomonadaceae genus: sphingomonas binomial name sphingomonas azotifigensxie and yokota 2006 type strain cctcc ab205007, cip 109209, dsm 18530, iam 15283, ifo 15497, jcm 21734, nbrc 15497, y39 synonyms sphingomonas azotofixans