photorhizobium thompsonianum photorhizobium thompsonianum photorhizobium thompsonianum is a bacterium from the genus of photorhizobium. photorhizobium thompsonianum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: nitrobacteraceae genus: photorhizobium species: p. thompsonianum binomial name photorhizobium thompsonianumeaglesham et al. 1990