Abstract
Fusicoccin (FC), a diterpene glucoside very active in stimulating proton/K + exchange in higher plant tissues, is shown to increase in vitro the K +Mg 2+-stimulated ATPase activity of plasmalemma-enriched membrane preparations from maize coleoptiles and from spinach leaves. The concentration/activity curve of the effect of FC on ATPase closely parallels that of the in vivo effect on K + uptake. DAK, a derivative of FC inactive in vivo on K + uptake and associated responses, is also inactive on the ATPase activity in vitro. These results are consistent with the hypothesis that the stimulating effects of FC on proton extrusion and cation uptake are due to its capacity to activate at cell membrane level a H +/K + exchange system depending on ATP as an energy source.
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