bradyrhizobium oligotrophicum bradyrhizobium oligotrophicum bradyrhizobium oligotrophicum is a nitrogen-fixing bacteria from the genus of bradyrhizobium which was isolated from rice paddy soil in miyagi prefecture in japan. bradyrhizobium oligotrophicum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: nitrobacteraceae genus: bradyrhizobium species: b. oligotrophicum binomial name bradyrhizobium oligotrophicumramírez-bahena et al. 2013 type strain atcc 43045, dsm 12412, hattori strain s58, jcm 1494, lmg 10732, ncimb 12151 synonyms agromonas oligotrophica