azospirillum lipoferum azospirillum lipoferum azospirillum lipoferum is a species of microaerophilic, gram-negative, rod-shaped, nitrogen-fixing bacteria. they are currently most notable for the ability to enhance the success of certain agricultural plant products such as maize, rice, and wheat. azospirillum lipoferum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rhodospirillales family: azospirillaceae genus: azospirillum species: a. lipoferum binomial name azospirillum lipoferumreinhold (beijerinck 1925) tarrand et al. 1979 (approved lists 1980) synonyms "spirillum lipoferum" beijerinck 1925