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Published on August 19, 2005; 10.1104/pp.105.065698

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Received May 17, 2005
Returned for revision June 17, 2005
Accepted June 17, 2005

Enhancing Arabidopsis Salt and Drought Stress Tolerance by Chemical Priming for Its Abscisic Acid Responses

Gabor Jakab *, Jurriaan Ton , Victor Flors , Laurent Zimmerli , Jean-Pierre Métraux , and Brigitte Mauch-Mani

Institute of Botany, Biochemistry, University of Neuchâtel, CH-2007 Neuchatel, Switzerland; Department of Biology, Plant Biology, University of Fribourg, CH-1700 Fribourg, Switzerland
Institute of Botany, Biochemistry, University of Neuchâtel, CH-2007 Neuchatel, Switzerland
Institute of Botany, Biochemistry, University of Neuchâtel, CH-2007 Neuchatel, Switzerland; Departamento de Ciencias Experimentales, Área de Fisiología Vegetal, Universitat Jaume I, 12071 Castellon, Spain
Department of Biology, Plant Biology, University of Fribourg, CH-1700 Fribourg, Switzerland

* Corresponding author; email: gabor.jakab{at}unine.ch.

Drought and salt stress tolerance of Arabidopsis (Arabidopsis thaliana) plants increased following treatment with the nonprotein amino acid {beta}-aminobutyric acid (BABA), known as an inducer of resistance against infection of plants by numerous pathogens. BABA-pretreated plants showed earlier and higher expression of the salicylic acid-dependent PR-1 and PR-5 and the abscisic acid (ABA)-dependent RAB-18 and RD-29A genes following salt and drought stress. However, non-expressor of pathogenesis-related genes 1 and constitutive expressor of pathogenesis-related genes 1 mutants as well as transgenic NahG plants, all affected in the salicylic acid signal transduction pathway, still showed increased salt and drought tolerance after BABA treatment. On the contrary, the ABA deficient 1 and ABA insensitive 4 mutants, both impaired in the ABA-signaling pathway, could not be protected by BABA application. Our data demonstrate that BABA-induced water stress tolerance is based on enhanced ABA accumulation resulting in accelerated stress gene expression and stomatal closure. Here, we show a possibility to increase plant tolerance for these abiotic stresses through effective priming of the preexisting defense pathways without resorting to genetic alterations.




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