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FEBS Lett. 2000 May 26;474(1):43-7.

Abscissic acid specific expression of RAB18 involves activation of anion channels in Arabidopsis thaliana suspension cells.

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Physiologie Cellulaire et Moléculaire des Plantes, UMR CNRS 7632, Université Pierre et Marie Curie (Paris VI), 4 place Jussieu, 75252 Paris, Cedex 05, France.


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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