Azospirillum lipoferum, is a gram positive a-proteobacteria extensively studied due to its properties to influence plant growth, due to this symbiotic characteristic this bacteria is qualified as a Growth-Promoting Rhizobacteria (PGPR). The organism was first described by Martinus Beijerinck who named it Spirillum lipoferum , in 1925. Later, the classification was revised by Tarrand et al. who renamed it Azospirillum lipoferum which means "small, fat bearing, spiral".
Species: Azospirillum lipoferum