Abstract
The abscissic acid (ABA) transduction cascade following the plasmalemma perception was analyzed in intact Arabidopsis thaliana suspension cells. In response to impermeant ABA, anion currents were activated and K + inward rectifying currents were inhibited. Anion current activation was required for the ABA specific expression of RAB18. By contrast, specific inhibition of K + channels by tetraethylammonium or Ba 2+ did not affect RAB18 expression. Thus, outer plasmalemma ABA perception triggered two separated signaling pathways.
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