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ABA affected K+ and solute transport between guard cells and epidermal cells as indicated by K+ staining and plasmolysis. ABA enhanced K+ (86Rb) uptake into epidermal cells. To find out whether the ABA enhanced accumulation of K+ (86Rb) in epidermal cells is active, uptake in the presence of exogenous ATP was studied. These studies hinted that K+ (86Rb) uptake by epidermal cells is a passive process, while its release is an active one. This was verified by applying iodoacetate, which interferes with energy supply. The epidermal cells thus seem to play a role in stomatal movement.