Abstract
In a study of various phytopathogenic fungi, we found that fungi that belong to the genus Rhizoctonia produce IAA efficiently from tryptophan. R. solani Kiihn MAFF305219, 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.
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