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Interactions of Herbicides with Photosynthetic Electron Transport

Published online by Cambridge University Press:  12 June 2017

E. Patrick Fuerst
Affiliation:
Dep. Agron. & Soils, Washington State Univ., Pullman, WA 99164-6420
Michael A. Norman
Affiliation:
Dep. Agron. & Soils, Washington State Univ., Pullman, WA 99164-6420

Abstract

The two primary sites of herbicide action in photosynthetic electron transport are the inhibition of photosystem II (PS II) electron transport and diversion of electron flow through photosystem I (PS I). PS II electron transport inhibitors bind to the D1 protein of the PS II reaction center, thus blocking electron transfer to plastoquinone. Inhibition of PS II electron transport prevents the conversion of absorbed light energy into electrochemical energy and results in the production of triplet chlorophyll and singlet oxygen which induce the peroxidation of membrane lipids. PS I electron acceptors probably accept electrons from the iron-sulfur protein, Fa/Fb. The free radical form of the herbicide leads to the production of hydroxyl radicals which cause the peroxidation of lipids. Herbicide-induced lipid peroxidation destroys membrane integrity, leading to cellular disorganization and phototoxicity.

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Type
Special Topics
Copyright
Copyright © 1991 by the Weed Science Society of America 

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