pseudoxanthobacter soli pseudoxanthobacter soli pseudoxanthobacter soli is a gram negative, aerobic rod-shaped and nitrogen fixing bacterium which has been isolated from soil from an agricultural research field station in kaohsiung county in taiwan. pseudoxanthobacter soli scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: pseudoxanthobacteraceae genus: pseudoxanthobacter species: p. soli binomial name pseudoxanthobacter soliarun et al. 2008 type strain cc4, cip 109513, dsm 19599