固氮菌属（学名：Azotobacter）为假单胞菌目假单胞菌科的一属好氧或兼性厌氧发酵型革兰氏阴性杆菌。大的椭圆细胞。出现在土壤和水；有一个种与植物的根有关。此属的模式种为圆褐固氮菌Azotobacter chroococcum)。
下属物种
- 阿美尼亚固氮菌 Azotobacter armeniacus Thompson and Skerman 1981
- 拜氏固氮菌 Azotobacter beijerinckii Lipman 1904
- Azotobacter bryophylli Liu et al. 2019
- 圆褐固氮菌 Azotobacter chroococcum Beijerinck 1901
- Azotobacter macrocytogenes Jensen 1955
- 黑色固氮菌 Azotobacter nigricans Krassilnikov 1949
- 雀稗固氮菌 Azotobacter paspali Döbereiner 1966
- Azotobacter salinestris Page and Shivprasad 1991
- 维涅兰德固氮菌 Azotobacter vinelandii Lipman 1903，棕包固氮菌
参考文献
- LPSN - List of Prokaryotic names with Standing in Nomenclature
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