mesorhizobium temperatum mesorhizobium temperatum mesorhizobium temperatum is a gram-negative, aerobic, non-spore-forming bacterium from the genus mesorhizobium which was isolated from astragalus adsurgens which were found in northern regions of china. mesorhizobium temperatum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: phyllobacteriaceae genus: mesorhizobium species: m. temperatum binomial name mesorhizobium temperatumgao et al. 2004 type strain ccbau 11018, hambi 2583, iam 15333, jcm 21781, lmg 23931, sdw018