Abstract
Cytosolic calcium concentrations (Ca 1) of barley aleurone protoplasts after stimulation with the plant hormone abscisic acid (ABA) were measured by using the calcium-sensitive flourescent dye Indo.1. The measured basal Ca 1 is about 200 nM. Stimulation with ABA induces a strong dose-dependent decrease in Ca 1 to a minimal value of about 50nM. The decrease occurs within 5 s. The Ca 2+ antagonists La 3+ and Cd 2+ inhibit the ABA-induced Ca 1 decrease in a dose-dependent manner, while the Ca 2+ channel blockers verapamil and nifedipine give no inhibition. The induction of Ca 1 decrease by ABA is consistent with activation of the plasma membrane Ca 2+- ATPase by ABA. The possible role of this ABA-induced Ca 1 decrease in ABA signal transduction and in counteracting the effects of gibberellic acid are discussed.
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