Indole-3-butyric acid (IBA) production in culture medium by wild strain Azospirillum brasilense.

Some microorganisms found in the soil are able to produce substances which regulate plant growth. In this study, we show the presence of a substance associated with auxin activity, identified as indole-3-butyric acid (IBA), in Azospirillum brasilense UAP 154 growth medium. A.