mesorhizobium acaciae mesorhizobium acaciae mesorhizobium acaciae is a bacterium from the genus of mesorhizobium which has been isolated from the nodules of the tree acacia melanoxylon in guangdong in china. mesorhizobium acaciae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: phyllobacteriaceae genus: mesorhizobium species: m. acaciae binomial name mesorhizobium acaciaezhu et al. 2015 type strain ccbau 101090, jcm 30534, ritf 1220, ritf 741, ritf 909