Effect of water-soluble vitamins on the production of indole-3-acetic acid by Azospirillum brasilense.
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.
Zakharova
E A
EA
Laboratory of Biochemistry, Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov. root@ibppm.saratov.su
Iosipenko
A D
AD
Ignatov
V V
VV
D015806:Azospirillum brasilense / Q000187:drug effects / Q000378:metabolism*; D003470:Culture Media; D004305:Dose-Response Relationship, Drug; D007210:Indoleacetic Acids / Q000378:metabolism*; D008962:Models, Theoretical; D010937:Plant Growth Regulators / Q000378:metabolism*; D014364:Tryptophan / Q000378:metabolism*; D014803:Vitamin B Complex / Q000494:pharmacology*
D003470:Culture Media; D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D014803:Vitamin B Complex; C030737:indoleacetic acid; D014364:Tryptophan