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Published on June 9, 2006; 10.1104/pp.106.080218

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Received March 16, 2006
Returned for revision April 24, 2006
Accepted May 23, 2006

Induction of ABA-regulated gene expression by diacylglycerol pyrophosphate involves Ca2+ and anion currents in Arabidopsis thaliana suspension cells

Christine Zalejski , Sophie Paradis , Régis Maldiney , Yvette Habricot , Emile Miginiac , Jean-Pierre Rona , and Emmanuelle Jeannette *

Université Pierre et Marie Curie-Paris 6, FRE 2846, Physiologie Cellulaire et Moléculaire des Plantes, case 156, Le Raphaël, 3 rue Galilée, Ivry-sur-Seine, F-94200; Centre National de la Recherche Scientifique, FRE 2846, Physiologie Cellulaire et Moléculaire des Plantes, case 156, Le Raphaël, 3 rue Galilée, Ivry-sur-Seine, F-94200
Université Paris 7-Denis Diderot, Equipe d'Accueil 3514, Electrophysiologie des Membranes, case 7069, 2 place Jussieu, Paris, F-75251 CEDEX 05

* Corresponding author; email: ema{at}ccr.jussieu.fr.

Diacylglycerol pyrophosphate (DGPP) was recently shown to be a possible intermediate in abscisic acid (ABA) signaling. In this study, reverse transcription-PCR (RT-PCR) of ABA-upregulated genes was used to evaluate the ability of DGPP to trigger gene expression in Arabidopsis thaliana suspension cells. At5g06760, LTI30, RD29A and RAB18 were stimulated by ABA and also specifically expressed in DGPP-treated cells. The use of the Ca2+ channel blockers fluspirilene and pimozide and the Ca2+ chelator EGTA allowed to show that Ca2+ was required for the ABA induction of DGPP formation. In addition, Ca2+ participated to DGPP induction of gene expression via the stimulation of anion currents. Hence, a sequence of Ca2+, DGPP and anion currents, constituting a core of early ABA-signaling events necessary for gene expression, is proposed.




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