Redox Activity at the Surface of Oat Root Cells

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Abstract
Electron transport activity at the cell surface of intact oat seedlings was examined by measuring the oxidation and/or reduction of agents in the medium bathing the roots. Oxidation of NADH with or without added electron acceptors and reduction of ferricyanide by an endogenous electron donor were detected. The activities appear to be due to electron transfer at, or across, the plasma membrane and not due to reagent uptake or leakage of oxidants or reductants. NADH-ferricyanide oxidoreductase activity was also detected in plasma membrane-enriched preparations from Avena roots. Based on redox response to pH, various ions and to a variety of electron donors and acceptors, more than 1 electron transport system is apparently at the plasma membrane.

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