Journal Article

Efficient Conversion of L-Tryptophan to Indole-3-Acetic Acid and/or Tryptophol by Some Species of <i>Rhizoctonia</i>

Toshiko Furukawa, Jinichiro Koga, Takashi Adachi, Kunihei Kishi and Kunihiko Syono

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 37, issue 7, pages 899-905
Published in print October 1996 | ISSN: 0032-0781
e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029037
Efficient Conversion of L-Tryptophan to Indole-3-Acetic Acid and/or Tryptophol by Some Species of Rhizoctonia

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In a study of various phytopathogenic fungi, we found that fungi that belong to the genus Rhizoctonia produce IAA efficiently from tryptophan. R. solani Kühn MAFF-305219, in particular, produced large amounts of tryptophol (Tol), which was assumed to be a specific by-product of the indole-3-pyruvate (IPy) pathway, in addition to IAA. Therefore, this fungus seemed suitable for analysis of the function and the regulation of the biosynthesis of auxin by a fungal pathogen. Under normal aerobic conditions, the ratio of IAA to Tol synthesized by this strain was higher than that under less aerobic conditions. In metabolic studies with various indole derivatives, R. solani converted L-tryptophan and indole-3-acetaldehyde to IAA and Tol, but other indole derivatives were scarcely metabolized. These results suggest that both IAA and Tol are synthesized from tryptophan through the IPy pathway in Rhizoctonia.

Keywords: Auxin; Fungi; IAA; Indole-3-pyruvate pathway; Rhizoctonia; Tryptophol

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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