Inhibition of Photosynthetic Electron Transport by Diphenyl Ether Herbicides 12
AUTOR(ES)
Bugg, M. Wayne
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=440263Documentos Relacionados
- Mode of Action Studies on Nitrodiphenyl Ether Herbicides 1: II. The Role of Photosynthetic Electron Transport in Scenedesmus obliquus
- Mechanism of Linolenic Acid-induced Inhibition of Photosynthetic Electron Transport 12
- Mode of Action Studies on Nitrodiphenyl Ether Herbicides: I. Use of Barley Mutants to Probe the Role of Photosynthetic Electron Transport
- Porphyrin Accumulation and Export by Isolated Barley (Hordeum vulgare) Plastids (Effect of Diphenyl Ether Herbicides).
- The domain structure of protoporphyrinogen oxidase, the molecular target of diphenyl ether-type herbicides