Interactions of Herbicides with Photosynthetic Electron Transport

• DOI: 10.1017/s0043174500073227
• Publication Date: 2019-05-17T16:47:26Z
• Authors: E. Patrick Fuerst; Michael A. Norman
• Keywords: Plastoquinone; Electron acceptor; P700; Cytochrome b6f complex

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