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  • Title: Effect of water-soluble vitamins on the production of indole-3-acetic acid by Azospirillum brasilense.
    Author: Zakharova EA, Iosipenko AD, Ignatov VV.
    Journal: Microbiol Res; 2000 Sep; 155(3):209-14. PubMed ID: 11061189.
    Abstract:
    The effects of six water-soluble vitamins on tryptophan-dependent synthesis of indole-3-acetic acid in Azospirillum brasilense were investigated. A multifactorial regression analysis was employed to produce models of indole-3-acetic acid synthesis versus concentrations of tryptophan and the vitamins added to the growth medium. Very low levels of the B-group vitamins added at 10 to 100 microg l(-1) affected production of indole-3-acetic acid in A. brasilense. The largest release of this phytohormone was observed after amendment with pyridoxine and nicotinic acid. Results of the study suggest a role these vitamins may fulfil in the regulation of indole-3-acetic acid synthesis in A. brasilense.
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