Inhibition of Photosynthetic Electron Transport by Diphenyl Ether Herbicides | Zendy

M. Wayne Bugg | Zendy; John Whitmarsh | Zendy; C. E. Rieck | Zendy; William S. Cohen | Zendy

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Inhibition of Photosynthetic Electron Transport by Diphenyl Ether Herbicides

Author(s) -

M. Wayne Bugg,

John Whitmarsh,

C. E. Rieck,

William S. Cohen

Publication year - 1980

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.65.1.47

Subject(s) - plastoquinone , chemistry , electron transport chain , photosystem i , chloroplast , cytochrome b6f complex , photosystem ii , photochemistry , photosystem , photosynthesis , hill reaction , diphenyl ether , cytochrome , ether , thylakoid , medicinal chemistry , biochemistry , organic chemistry , enzyme , gene

The effects of the diphenyl ether herbicides HOE 29152 (methyl-2[4-(4-trifluoromethoxy) phenoxy] propanoate) and nitrofluorfen (2-chloro-1-[4-nitrophenoxy]-4-[trifluoromethyl]benzene) on photosynthetic electron transport have been examined with pea seedling and spinach chloroplasts. Linear electron transport (water to ferricyanide or methylviologen) is inhibited in treated chloroplasts, but neither photosystem II activity (water to dimethylquinone plus dibromothymoquinone) nor photosystem I activity (diaminodurene to methylviologen) is affected. Cyclic electron flow, cata-lyzed by either phenazine methosulfate or diaminodurene, is resistant to inhibition by nitrofluorfen. In diphenyl ether-treated chloroplasts the half-time for the dark reduction of cytochrome f is increased 5- to 15-fold. These data indicate that the site of inhibition for the diphenyl ethers is between the two photosystems in the plastoquinone-cytochrome f region.

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