Journal Article

A New Lead Chemical for Strigolactone Biosynthesis Inhibitors

Shinsaku Ito, Nobutaka Kitahata, Mikihisa Umehara, Atsushi Hanada, Atsutaka Kato, Kotomi Ueno, Kiyoshi Mashiguchi, Junko Kyozuka, Koichi Yoneyama, Shinjiro Yamaguchi and Tadao Asami

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 51, issue 7, pages 1143-1150
Published in print July 2010 | ISSN: 0032-0781
Published online June 2010 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcq077

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Several triazole-containing chemicals have previously been shown to act as efficient inhibitors of cytochrome P450 monooxygenases. To discover a strigolactone biosynthesis inhibitor, we screened a chemical library of triazole derivatives to find chemicals that induce tiller bud outgrowth of rice seedlings. We discovered a triazole-type chemical, TIS13 [2,2-dimethyl-7-phenoxy-4-(1H-1,2,4-triazol-1-yl)heptan-3-ol], which induced outgrowth of second tiller buds of wild-type seedlings, as observed for non-treated strigolactone-deficient d10 mutant seedlings. TIS13 treatment reduced strigolactone levels in both roots and root exudates in a concentration-dependent manner. Co-application of GR24, a synthetic strigolactone, with TIS13 canceled the TIS13-induced tiller bud outgrowth. Taken together, these results indicate that TIS13 inhibits strigolactone biosynthesis in rice seedlings. We propose that TIS13 is a new lead compound for the development of specific strigolactone biosynthesis inhibitors.

Keywords: Chemical library; Inhibitor; P450; Rice; Strigolactone; Triazole

Journal Article.  3691 words.  Illustrated.

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

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