Plant Physiol.
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Plant Physiology 57:245-248 (1976)
© 1976 American Society of Plant Biologists

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Articles

Inhibition of ent-Kaurene Oxidation and Growth by {alpha}-Cyclopropyl-{alpha}-(p-methoxyphenyl)-5-pyrimidine Methyl Alcohol 1

Ronald C. Coolbaugh2 and Roxanne Hamilton

a Department of Natural Sciences and Mathematics, Oregon College of Education, Monmouth, Oregon 97361

Growth of Alaska peas (Pisum sativum) is inhibited more than 60% by {alpha}-cyclopropyl-{alpha}-(p-methoxyphenyl)-5-pyrimidine methyl alcohol (ancymidol) treatment. This growth inhibition can be reversed completely by gibberellic acid application. Cell-free enzyme preparations from pea shoot tips and wild cucumber (Marah oreganus) endosperm were used to test the effects of this substituted pyrimidine on the incorporation of mevalonic acid-14C into ent-kaurene and ent-kaurenol, respectively. Ancyidol (10–6M) completely blocks the conversion of ent-kaurene to ent-kaurenol. This result was confirmed with the wild cucumber endosperm system by testing the direct conversion of labeled ent-kaurene to ent-kaurenol. Ancymidol at higher concentrations (10–3M) inhibits the incorporation of mevalonic acid-14C into ent-kaurene to a lesser extent. It is concluded that one mode of action of this growth regulator is the inhibition of gibberellin biosynthesis.

2 Present address: Division of Biochemistry, Department of Chemistry, University of California, Los Angeles, Calif. 90024.

1 This work was supported by a grant from Eli Lilly and Co.






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Copyright © 1976 by the American Society of Plant Biologists