Authors: Ayelen M Distéfano Denise Scuffi Carlos GarcíaMata Lorenzo Lamattina Ana M Laxalt
Publish Date: 2012/08/30
Volume: 236, Issue: 6, Pages: 1899-1907
Abstract
Nitric oxide NO has recently emerged as a second messenger involved in the complex network of signaling events that regulate stomatal closure Little is known about the signaling events occurring downstream of NO Previously we demonstrated the involvement of phospholipase D PLD in NO signaling during stomatal closure PLDδ one of the 12 Arabidopsis PLDs is involved in dehydration stress responses To investigate the role of PLDδ in NO signaling in guard cells we analyzed guard cells responses using Arabidopsis wild type and two independent pldδ single mutants In this work we show that pldδ mutants failed to close the stomata in response to NO Treatments with phosphatidic acid the product of PLD activity induced stomatal closure in pldδ mutants Abscisic acid ABA signaling in guard cells involved H2O2 and NO production both required for ABAinduced stomatal closure pldδ guard cells produced similar NO and H2O2 levels as the wild type in response to ABA However ABA or H2O2induced stomatal closure was impaired in pldδ plants These data indicate that PLDδ is downstream of NO and H2O2 in ABAinduced stomatal closureWe thank Teun Munnik and Bastiann Bargmann Swammerdam Institute for Life Sciences University of Amsterdam Amsterdam The Netherlands for providing us the mutants seeds stocks This work was financially supported by UNMdP AML LL Consejo Nacional de Investigaciones Científicas y Técnicas CONICET AMD AML CGM LL and Agencia Nacional de Promoción Científica y Tecnológica ANPCyT AML CGM LL
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