Inhibition of Plant Protoporphyrinogen Oxidase by the Herbicide Acifluorfen-Methyl

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,...

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Veröffentlicht in:	Plant physiology (Bethesda) 1989-08, Vol.90 (4), p.1239-1242
Hauptverfasser:	WITKOWSKI, D. A, HALLING, B. P
Format:	Artikel
Sprache:	eng
Schlagworte:	Biological and medical sciences Chloroplasts Communications Fundamental and applied biological sciences. Psychology Herbicides Metabolism Metabolism and Enzymology Metabolism. Physicochemical requirements Oxidases Oxidation Photosensitizing agents Plant physiology and development Plants Plastids Porphyrins Protoporphyrins Tetrapyrroles
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Zusammenfassung:	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.)
ISSN:	0032-0889 1532-2548
DOI:	10.1104/pp.90.4.1239