neorhizobium neorhizobium neorhizobium is a genus of gram-negative soil bacteria that fix nitrogen. it was recently segregated from the genus rhizobium. neorhizobium forms an endosymbiotic nitrogen-fixing association with roots of legumes. neorhizobium scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: rhizobiaceae genus: neorhizobiummousavi et al. 2014 type species neorhizobium galegaelindström 1989 species neorhizobium alkalisoli (lu et al. 2009) mousavi et al. 2015 neorhizobium galegae (lindström 1989) mousavi et al. 2015 neorhizobium huautlense (wang et al. 1998) mousavi et al. 2015 "neorhizobium lilium" liu et al. 2020 neorhizobium petrolearium (zhang et al. 2012) kuzmanović et al. 2022 neorhizobium tomejilense soenens et al. 2020 neorhizobium vignae (ren et al. 2011) hördt et al. 2020