Inhibition of Plant Protoporphyrinogen Oxidase by the Herbicide Acifluorfen-methyl

Overview

Journal Plant Physiol

Specialty Physiology

Date 1989 Aug 1

PMID 16666913

Citations 18

Authors

D A Witkowski

B P Halling

Affiliations

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Abstract

The effect of acifluorfen-methyl on tetrapyrrole synthesis in greening chloroplasts of Cucumis sativus was examined. Formation of Mg-proto-porphyrin IX from delta-aminolevulinate was reduced 98% by 10 micromolar acifluorfen-methyl. Conversion of protoporphyrin IX to Mg-protoporphyrin IX was unaffected, but protoporphyrin IX synthesis from delta-aminolevulinate was blocked, indicating a site of inhibition prior to the Mg-chelatase. The enzymic oxidation of protoporphyrinogen IX to protoporphyrin IX was highly sensitive to acifluorfen-methyl, indicating that the site of action of the herbicide is the protoporphyrinogen oxidase. ((c) 1989 FMC Corporation. All rights reserved.).

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