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Inhibition of abscisic acid biosynthesis inCercospora rosicola by triarimol

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Abstract

The fungicide triarimol was tested for its effect on abscisic acid (ABA) accumulation in growing culturesof Cercospora rosicola. ABA accumulation was reduced by approximately 50% with 10−8 M triarimol. Growth ofC. rosicola, as measured by dry weight accumulation, was inhibited by triarimol concentrations at or greater than 10−7 M. These results are compared with those obtained with clomazone, ancymidol, and paclobutrazol, which inhibit ABA accumulation by 50% at concentrations of 5 × 10−5, 5 × 10−6, and 5 × 10−7 M, respectively. Triarimol, therefore, is among the most potent inhibitors of ABA biosynthesis reported to date. Feeding studies with [14C]mevalonic acid confirmed the inhibition of ABA biosynthesis by 5 × 10−8 M triarimol. These results support previous suggestions that one or more of the steps in the ABA biosynthetic pathway from mevalonic acid is catalyzed by cytochrome P-450. Feeding studies with 1′-deoxy-[2H]-ABA in resuspended cultures ofC. rosicola show that the conversion of this substrate is not inhibited by triarimol.

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Author notes

  1. Laila F. Al-Nimri & Ronald C. Coolbaugh

    Present address: Department of Botany and Plant Pathology, Purdue University, 47907, West Lafayette, IN, USA

Authors and Affiliations

  1. Department of Botany, Iowa State University, 50011, Ames, Iowa, USA

    Laila F. Al-Nimri & Ronald C. Coolbaugh

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  1. Laila F. Al-Nimri
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  2. Ronald C. Coolbaugh
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Al-Nimri, L.F., Coolbaugh, R.C. Inhibition of abscisic acid biosynthesis inCercospora rosicola by triarimol. J Plant Growth Regul 9, 221–225 (1990). https://doi.org/10.1007/BF02041966

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  • DOI: https://doi.org/10.1007/BF02041966

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