Reduction-Oxidation Activities of Plant Plasmamembranes
Plant cells catalyse a number of reduction-oxidation (redox) reactions at the cell surface. There is good evidence that the plasmamembrane contains a redox charge transfer system which conducts electrons from internal reductants to external oxidants such as non-permeant anionic ferricyanide. This ferricyanide reductase activity which is associated with a net acidification of the external medium has been observed in cultured cells (Craig and Crane, 1981; Barr, Crane and Craig, 1984; Chalmers, Coleman and Walton, 1984) in roots (Federico and Giartosio, 1983; Rubinstein and Stern, 1986; Sijmons, Lanfermeijer, DeBoer, Prins and Bienfait, 1984) and in leaf cells (Ivankina, Novak and Miclashevich, 1984; Neufeld and Bown, 1987).
KeywordsRedox System Fluorescein Diacetate Carrot Cell Proton Extrusion Ferricyanide Reduction
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