Depolarization of Cell Membrane Potential during Trans-Plasma Membrane Electron Transfer to Extracellular Electron Acceptors in Iron-Deficient Roots of Phaseolus vulgaris L.
作者： Peter C. Sijmons , Frank C. Lanfermeijer , Albertus H. de Boer , Hidde B. A. Prins , H. Frits Bienfait
DOI: 10.1104/PP.76.4.943
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摘要: Transfer of electrons from the cytosol bean (Phaseolus vulgaris L.) root cells to extracellular acceptors such as ferricyanide and FeIIIEDTA causes a rapid depolarization membrane potential. This effect is most pronounced (30-40 millivolts) with Fe-deficient plants, which have an increased capacity reduce ferric salts. Ferrocyanide has no effect. In state reduction, H+ (1H+/2 electrons) K+ ions are excreted. The reduction salts by roots plants driven cellular NADPH (Sijmons, van den Briel, Bienfait 1984 Plant Physiol 75: 219-221). From this potential depolarization, we conclude that trans-plasma electron transfer primary process in
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