Azospirillum
''Azospirillum'' is a Gram-negative, microaerophilic, non-fermentative and nitrogen-fixing bacterial genus from the family of Rhodospirillaceae. ''Azospirillum'' bacteria can promote plant growth. Characteristics The genus ''Azospirillum'' belongs in the Alphaproteobacteria class of bacteria. ''Azospirillum'' are Gram-negative bacteria, gram-negative, do not form spores, and have a slightly twisted oblong-rod shape. ''Azospirillum'' have at least one flagellum and sometimes multiple flagella, which they use to move rapidly. ''Azospirillum'' are Aerobic organism, aerobic, but many can also function as microaerobic diazotrophs, meaning, under low oxygen conditions, they can change inert nitrogen from the air into biologically usable forms. At least three species, ''A. melinis'', ''A. thiophilum'', and ''A. humicireducens'' are Facultative anaerobic organism, facultative anaerobes, and can live, if necessary, without oxygen. Growth of ''Azospirillum'' is possible between 5 ° ...
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