| azospirillum | A genus of gram-negative bacteria that occurs free-living in the soil or associated with the roots of cereal crops or grasses. (12 Dec 1998) |
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| azospirillum brasilense | Motile, free-living, gram-negative bacteria that occur in the soil. They are aerobic or microaerophilic and are sometimes capable of nitrogen fixation. (12 Dec 1998) |