title: Enhancing Arabidopsis salt and drought stress tolerance by chemical priming for its abscisic acid responses.
abstract: 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.
authors.affiliation: Institute of Botany, Biochemistry, University of Neuchâtel, Switzerland. gabor.jakab@unine.ch
authors.forename: Gabor
authors.initials: G
authors.lastname: Jakab
authors.forename: Jurriaan
authors.initials: J
authors.lastname: Ton
authors.forename: Victor
authors.initials: V
authors.lastname: Flors
authors.forename: Laurent
authors.initials: L
authors.lastname: Zimmerli
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Métraux
authors.forename: Brigitte
authors.initials: B
authors.lastname: Mauch-Mani
mesh_terms: D000040:Abscisic Acid / Q000096:biosynthesis / Q000494:pharmacology*; D000613:Aminobutyrates / Q000494:pharmacology*; D017360:Arabidopsis / Q000187:drug effects* / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D008969:Molecular Sequence Data; D018515:Plant Leaves / Q000187:drug effects / Q000502:physiology; D011392:Proline / Q000378:metabolism; D020156:Salicylic Acid / Q000378:metabolism / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects; D012965:Sodium Chloride / Q000378:metabolism / Q000494:pharmacology*; D013997:Time Factors; D014867:Water / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D000613:Aminobutyrates; D014867:Water; C047667:3-aminobutyric acid; D012965:Sodium Chloride; D000040:Abscisic Acid; D011392:Proline; D020156:Salicylic Acid