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. 1989 Aug;90(4):1239–1242. doi: 10.1104/pp.90.4.1239

Inhibition of Plant Protoporphyrinogen Oxidase by the Herbicide Acifluorfen-Methyl

Debra A Witkowski 1, Blaik P Halling 1
PMCID: PMC1061873  PMID: 16666913

Abstract

The effect of acifluorfen-methyl on tetrapyrrole synthesis in greening chloroplasts of Cucumis sativus was examined. Formation of Mg-proto-porphyrin IX from δ-aminolevulinate was reduced 98% by 10 micromolar acifluorfen-methyl. Conversion of protoporphyrin IX to Mg-protoporphyrin IX was unaffected, but protoporphyrin IX synthesis from δ-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. (© 1989 FMC Corporation. All rights reserved.)

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Selected References

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