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Plant Physiology 80:122-125 (1986)
© 1986 American Society of Plant Biologists

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Articles

Paclobutrazol Inhibits Abscisic Acid Biosynthesis in Cercospora rosicola

Shirley M. Norman, Raymond D. Bennett, Stephen M. Poling, Vincent P. Maier and Mary D. Nelson

United States Department of Agriculture, Agricultural Research Service, Fruit and Vegetable Chemistry Laboratory, Pasadena, California 91106

Three plant growth regulators, paclobutrazol, ancymidol, and decylimidazole, which are putative inhibitors of gibberellin (GA) biosynthesis, were studied to determine their effect on abscisic acid (ABA) biosynthesis in the fungus Cercospora rosicola. All three compounds inhibited ABA biosynthesis, and paclobutrazol was the most effective, inhibiting ABA 33% at 0.1 micromolar concentrations. In studies using (E,E,)-[1-14C] farnesyl pyrophosphate, it was shown that ancymidol blocked biosynthesis prior to farnesyl pyrophosphate (FPP), whereas paclobutrazol and decylimidazole acted after FPP. The three inhibitors did not prevent 4'-oxidation of (2Z,4E)-{alpha}-ionylideneacetic acid. C. rosiciola metabolized ancymidol by demethylation to {alpha}-cyclopropyl-{alpha}-(p-hydroxyphenyl)-5-pyrimidine methyl alcohol. Paclobutrazol was not metabolized by the fungus. Information that these plant growth regulators inhibit ABA as well as GA biosynthesis should prove useful in determining the full range of action of these compounds.




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Copyright © 1986 by the American Society of Plant Biologists