rhizobium tropici rhizobium tropici rhizobium tropici is a root nodule bacterium. rhizobium tropici scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: rhizobiaceae genus: rhizobium species: r. tropici binomial name rhizobium tropicimartínez-romero et al. 1991 type strain atcc 49672ciat 899dsm 11418hambi 1163ifo 15247jcm 21072lmg 9503nbrc 15247