Summary
The coupling of ion transport to energy sources in the light and in the dark in green cells ofAtriplex spongiosa leaves was investigated using light of different qualities, an inhibitor of electron transport (dichlorophenyl dimethyl urea), and an uncoupler (p-CF3O-carbonyl cyanide phenylhydrazone). Two different mechanisms of ion uptake were, distinguished. (1) A light-dependent Cl− pump which is linked to light-dependent K+ uptake. The energy for this pump is probably derived from photosynthetic electron transport or from nicotinamide adenine dinucleotide phosphate, reduced form. This mechanism is dichlorophenyl dimethyl urea-sensitive and enhanced by uncouplers. (2) A mechanism independent of light, which operates at the same rate in the light and in the dark. This mechanism is sensitive to uncouplers. It is probably aK−Na exchange mechanism since K+ and Cl− uptake and a small net uptake of H+ are balanced by Na+ loss.
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Lüttge, U., Pallaghy, C.K. & Osmond, C.B. Coupling of ion transport in green cells ofAtriplex spongiosa leaves to energy sources in the light and in the dark. J. Membrain Biol. 2, 17–30 (1970). https://doi.org/10.1007/BF01869847
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DOI: https://doi.org/10.1007/BF01869847