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Inhibition of Chloroplast-Mediated Reactions by Quizalofop Herbicide

Published online by Cambridge University Press:  12 June 2017

Michael A. Ruizzo  and
Stanley F. Gorski
Michael A. Ruizzo
Affiliation:
Dep. Hortic., The Ohio State Univ., Columbus, OH 43210
Stanley F. Gorski
Affiliation:
Dep. Hortic., The Ohio State Univ., Columbus, OH 43210
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Abstract

A mechanism of action of the ethyl ester of quizalofop was determined in monocotyledonous and dicotyledonous plants. Quizalofop inhibited electron transport in both cucumber and corn chloroplasts. In corn, inhibition of electron transport was more pronounced under phosphorylating conditions. Half-maximal inhibition (I50) of ATP synthesis was achieved with a 75-μM concentration of quizalofop in coupled corn chloroplasts. Cucumber chloroplast ATP synthesis was not inhibited at herbicide concentrations up to 100 μM. Corn chloroplast fractions contained greater quantities of bound [U-14C] quizalofop ester following incubation in light and dark assays. Thin-layer radiochromatograms of 14C-labeled quizalofop showed no metabolism or degradation of parent ester incubated in light and dark chloroplast-mediated reactions. In our studies, it is apparent that the inhibitory action of quizalofop was due to the parent ester. The ester formulation of quizalofop appears to exhibit multiple activity in susceptible plant chloroplasts.

Keywords

Quizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy] phenoxy] propanoic acidcucumber, Cucumis sativus L. ‘Calypso’corn, Zea mays L. ‘Gold Cup’Oxyphenoxy propanoic acidelectron transportphotophosphorylation
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 36 , Issue 6 , November 1988 , pp. 713 - 718
Copyright
Copyright © 1988 by the Weed Science Society of America 

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