Azospira

A.zo' spi.ra . Fr. n. azote nitrogen; L. fem. n. spira winding, turn; M.L. fem. n. Azospira nitrogen‐fixing spiral. Proteobacteria / Betaproteobacteria / Rhodocyclales / Rhodocyclaceae / Azospira Gram‐negative curved motile rods (0.4–0.6 × 1.1–2.5 µm). One polar flagellum. Cells elongated in stationary cultures . Chemoorganoheterotrophic and aerobic; microaerophilic when fixing N 2 . Strictly respiratory; O 2 and nitrate are electron acceptors. Oxidase and catalase positive. Fix N 2 . Grow on acetate, n ‐caproate, ethanol, fumarate, L ‐glutamate, DL ‐lactate, L ‐malate, 2‐oxoglutarate, propionate, and succinate. The mol % G + C of the DNA is : 65–66. Type species : Azospira oryzae Reinhold‐Hurek and Hurek 2000, 658.