Inhibition of photosynthetic electron transport by diphenyl ether herbicides [Tested on pea and spinach chloroplasts]

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...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1980-01, Vol.65 (1), p.47-50
Main Authors: Bugg, M.W, Whitmarsh, J, Rieck, C.E, Cohen, W.S
Format: Article
Language:English
Subjects:
Chloroplasts
Ethers
Herbicides
Hoes
Oxidation
Peas
Phosphorylation
Photosystem II
Plants
Spinach
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Summary: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, catalyzed 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.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.65.1.47