Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Induction of wound response gene expression in tomato leaves by ionophores
Authors: Schaller, Andreas
Frasson, David
DOI: 10.1007/s004250000413
Published in: Planta
Volume(Issue): 212
Issue: 3
Pages: 431
Pages to: 435
Issue Date: 2001
Publisher / Ed. Institution: Springer
ISSN: 0032-0935
Language: English
Subject (DDC): 580: Plants (Botany)
Abstract: Three ionophores were used to investigate a potential role of the plasma-membrane (PM) potential in the regulation of systemic wound-response gene expression in tomato (Lycopersicon escuilentum Mill.) plants. Valinomycin, nigericin, and gramicidin, which affect the PM potential by dissipating H+ and K+ gradients, respectively, induced the rapid accumulation of wound-response gene transcripts. Transcript induction by gramicidin was kinetically, qualitatively and quantitatively similar to systemin-induced transcript accumulation. On a molar basis, gramicidin and nigericin, which affect gradients of both H+ and K+, were more effective than the K+-selective valinomycin. Hyperpolarization of the PM by fusicoccin, on the other hand, repressed wound-response gene expression and, at the same time, induced salicylic acid (SA) accumulation and the expression of pathogenesis-related proteins. We show here that the inhibition of the wound response after fusicoccin treatment is not mediated by elevated concentrations of SA but is likely a direct effect of PM hyperpolarization. The data indicate a role for the PM potential in the differential regulation of wound and pathogen defense responses.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: Life Sciences and Facility Management
Appears in collections:Publikationen Life Sciences und Facility Management

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