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Proc Natl Acad Sci U S A

Title:		Arabidopsis H(+)-ATPase AHA1 controls slow wave potential duration and wound-response jasmonate pathway activation
Author(s):		Kumari A; Chetelat A; Nguyen CT; Farmer EE;
Address:		"Department of Plant Molecular Biology, Biophore, University of Lausanne, CH-1015 Lausanne, Switzerland. Department of Plant Molecular Biology, Biophore, University of Lausanne, CH-1015 Lausanne, Switzerland edward.farmer@unil.ch"
Journal Title:		Proc Natl Acad Sci U S A
Year:		2019
Volume:		20190916
Issue:		40
Page Number:		20226 - 20231
DOI:		10.1073/pnas.1907379116
ISSN/ISBN:		1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking)
Abstract:		"Electrogenic proton pumps have been implicated in the generation of slow wave potentials (SWPs), damage-induced membrane depolarizations that activate the jasmonate (JA) defense pathway in leaves distal to wounds. However, no defined H(+)-ATPases have been shown to modulate these electrical signals. Pilot experiments revealed that the proton pump activator fusicoccin attenuated SWP duration in Arabidopsis Using mutant analyses, we identified Arabidopsis H(+)-ATPase 1 (AHA1) as a SWP regulator. The duration of the repolarization phase was strongly extended in reduced function aha1 mutants. Moreover, the duration of SWP repolarization was shortened in the presence of a gain-of-function AHA1 allele. We employed aphid electrodes to probe the effects of the aha1 mutation on wound-stimulated electrical activity in the phloem. Relative to the wild type, the aha1-7 mutant increased the duration and reduced the amplitudes of electrical signals in sieve tube cells. In addition to affecting electrical signaling, expression of the JA pathway marker gene JAZ10 in leaves distal to wounds was enhanced in aha1-7 Consistent with this, levels of wound-response jasmonoyl-isoleucine were enhanced in the mutant, as was defense against a lepidopteran herbivore. The work identifies a discrete member of the P-type ATPase superfamily with a role in leaf-to-leaf electrical signaling and plant defense"
Keywords:		Arabidopsis/*physiology Arabidopsis Proteins/*genetics/metabolism Cyclopentanes/*metabolism Electrophysiological Phenomena Herbivory Membrane Potentials/*genetics *Metabolic Networks and Pathways Oxylipins/*metabolism Phenotype Proton Pumps/genetics/metab;
Notes:		"MedlineKumari, Archana Chetelat, Aurore Nguyen, Chi Tam Farmer, Edward E eng Research Support, Non-U.S. Gov't 2019/09/19 Proc Natl Acad Sci U S A. 2019 Oct 1; 116(40):20226-20231. doi: 10.1073/pnas.1907379116. Epub 2019 Sep 16"