Stimulation of auxin-induced elongation of cucumber hypocotyl sections by dihydroconiferyl alcohol. Dihydroconiferyl alcohol inhibits indole-3-acetic acid degradation in vivo and in vitro |
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Authors: | Sakurai Naoki; Shibata Kozo; Kamisaka Seiichiro |
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Institution: | 1Department of Biology, Faculty of Science, Osaka City University Sumiyoshi-ku, Osaka 558, Japan
2Department of Chemistry, Faculty of Science, Osaka City University Sumiyoshi-ku, Osaka 558, Japan |
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Abstract: | The mechanism by which dihydroconiferyl alcohol (DCA) stimulatesindole-3-acetic acid (IAA)-induced elongation of cucumber hypocotylsections was studied. Although DCA did not affect the uptakeof IAA-5-3H by hypocotyl sections, the endogenous level of IAA-5-3Hin DCA-treated sections was much higher than in DCA untreatedones. IAA-5-3H in the incubation medium was degraded in thepresence of hypocotyl sections, and this degradation of IAAwas inhibited by DCA. An in vitro experiment with horseradishperoxidase revealed that DCA inhibited the IAA degrading activityof the oxidase, as did caffeic acid and ferulic acid. Theseresults suggested that DCA enhances IAA-induced cucumber hypocotylelongation by acting as an antioxidant of IAA. (Received June 4, 1975; ) |
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