Plant Physiol.
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Plant Physiology 65:47-50 (1980)
© 1980 American Society of Plant Biologists

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Articles

Inhibition of Photosynthetic Electron Transport by Diphenyl Ether Herbicides 1,2

M. Wayne Bugg3, John Whitmarsh4, Charles E. Rieck3 and William S. Cohen5

3 Department of Agronomy, University of Kentucky, Lexington, Kentucky 40506, 5 T. H. Morgan School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506, 4 Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907

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.

1 The investigation reported in this paper (79-3-85) is in connectin with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

2 This research was supported by U.S. National Science Foundation Grant PCM 76-17214 to W.S.C. and cooperation from the American Hoechst Corp. and the Rohm and Haas Company. J. W. was supported by U.S. National Science Foundation Grant PCM77-25196 to W. A. Cramer.






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Copyright © 1980 by the American Society of Plant Biologists