mesorhizobium robiniae mesorhizobium robiniae mesorhizobium robiniae is a gram-negative, aerobic, non-spore-forming motile bacteria from the genus mesorhizobium which was isolated from root nodule of robinia pseudoacacia which was found in yangling in the shaanxi province in china. mesorhizobium robiniae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: phyllobacteriaceae genus: mesorhizobium species: m. robiniae binomial name mesorhizobium robiniaezhou et al. 2010 type strain accc 14543, ccnwyc 115, hambi 3082