Along with Nitrogen Fixation Azospirillum is well known for its ability to produce plant growth promoting hormones, especially auxins viz. IAA, it is known to be largest IAA producing bacteria.
Azospirillum is a gram-negative, non-spore forming bacteria. In unfavorable conditions, such as desiccation and nutrient limitation, azospirilla can convert into enlarged cyst-like forms. It get mobility by means of flagella, it’s a facultative anaerobic bacteria. Azospirillum growth is possible between temperature 5°C to 42° C, and optimum pH range is 5 to 9
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