Abstract
The non-linear character of the voltage response of the intracellular electrical potential of the alga Hydrodictyon reticulatum to current injection was studied using a microelectrode technique. The phenomenon was strongly affected by the potassium ion concentration in the medium and by artificial electron acceptors (ferricyanide and the tetrathialfulvalene cation), by inhibitors of photosystem II and membrane H +-ATPase, by ethanol and by barium ions. Consideration of all the results suggests that the membrane potential dependence of potassium channels as well as changes in the ion concentration gradients in unstirred layers are responsible for the non-linear response phenomenon.
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