Inhibition of ent-Kaurene Oxidation and Growth by α-Cyclopropyl-α-(p-methoxyphenyl)-5-pyrimidine Methyl Alcohol | Zendy

Ronald C. Coolbaugh | Zendy; Roxanne Hamilton | Zendy

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Inhibition of ent-Kaurene Oxidation and Growth by α-Cyclopropyl-α-(p-methoxyphenyl)-5-pyrimidine Methyl Alcohol

Author(s) -

Ronald C. Coolbaugh,

Roxanne Hamilton

Publication year - 1976

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.57.2.245

Subject(s) - pisum , endosperm , mevalonic acid , gibberellin , pyrimidine , gibberellic acid , chemistry , sativum , shoot , biochemistry , growth regulator , biosynthesis , biology , enzyme , botany , germination

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-(14)C into ent-kaurene and ent-kaurenol, respectively. Ancyidol (10(-6)m) 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(-3)m) inhibits the incorporation of mevalonic acid-(14)C 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.

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