1987
DOI: 10.1104/pp.85.1.188
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Effects of Diclofop and Diclofop-Methyl on the Membrane Potentials of Wheat and Oat Coleoptiles

Abstract: Electrophysiological measurements were made on the mesophyll cells of wheat (Triticum aesti'um L. cv Waldron) and oat (APena satiia L. cv Garry) coleoptiles treated either with the herbicide didofop-methyl (methyl 2-(4-(2',4'-dichlorophenoxy)phenoxy)propanoate), or it's primary metabolite diclofop, (2-(4-(2',4'-dichlorophenoxy)phenoxy)-propanoic acid). Application of a 100 micromolar solution of diclofopmethyl to wheat coleoptiles had little or no effect on the membrane potential (EM) however in oat, EM slowly… Show more

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Cited by 37 publications
(56 citation statements)
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“…The relative activity of DM and DA on the maintenance of electrochemical gradients across the plasmalemma and the tonoplast in their study is consistent with the results observed with tonoplast vesicles at pH 5.7 (Table III). These workers (36) further suggested that depolarization of cell membrane potentials in the presence of DM could be explained by the partial hydrolysis of DM to the active DA. Our results using tonoplast vesicles indicate that hydrolysis to DA need not be invoked to explain the activity of DM.…”
Section: Permeabilitymentioning
confidence: 95%
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“…The relative activity of DM and DA on the maintenance of electrochemical gradients across the plasmalemma and the tonoplast in their study is consistent with the results observed with tonoplast vesicles at pH 5.7 (Table III). These workers (36) further suggested that depolarization of cell membrane potentials in the presence of DM could be explained by the partial hydrolysis of DM to the active DA. Our results using tonoplast vesicles indicate that hydrolysis to DA need not be invoked to explain the activity of DM.…”
Section: Permeabilitymentioning
confidence: 95%
“…This pH effect may be the basis for the apparent discrepancy between in vivo (36) and in vitro (25) relative activities of DM and DA. Wright and Shimabukuro (36) reported that DA caused a more rapid and more extensive depolarization of Ai, of oat coleoptile cells than DM did. In their experimental system, cells were bathed in medium at pH 5.7.…”
Section: Permeabilitymentioning
confidence: 99%
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“…Especula-se também que este feito poderia decorrer da inibição na síntese de lipídios, que refletiria em menor capacidade de polarização da membrana (Wright & Shimabukuro, 1987). Contudo, Di Tomaso (1994) questiona essa teoria, demonstrando, com Lolium rigidum resistente a diclofop, que a resposta da plasmalema a esses herbicidas provavelmente não esteja envolvida na fitotoxicidade provocada pelos inibidores da ACCase.…”
Section: Introductionunclassified