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Plant and Cell Physiology Advance Access published online on October 7, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn147
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Systemic resistance in Arabidopsis conferred by the mycorrhiza fungus Piriformospora indica requires jasmonic acid signaling and the cytoplasmic function of NPR1

Elke Stein1, Alexandra Molitor1, Karl-Heinz Kogel and Frank Waller

Institute of Phytopathology and Applied Zoology, Research Centre for BioSystems, Land Use and Nutrition, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany

Karl-Heinz Kogel. Institute of Phytopathology and Applied Zoology, Justus Liebig University, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany, Telephone: +49-641-99-37490, Fax: +49-641-99-37499, Email: Karl-Heinz.Kogel{at}agrar.uni-giessen.de


  Abstract

We analyzed requirement of specific defense pathways for powdery mildew (Golovinomyces orontii) resistance induced by the basidiomycete Piriformospora indica in Arabidopsis. P. indica root colonization reduced G. orontii conidia in wild type (Col-0), nonexpressor of PR1-3 (npr1-3) and NahG plants, but not in the npr1-1 null mutant. Therefore, cytoplasmic but not nuclear localization of NPR1 is required for P. indica-induced resistance. Two jasmonate signaling mutants were nonresponsive to P. indica, and jasmonic acid-responsive vegetative storage protein expression was primed and thus elevated in response to powdery mildew, suggesting that P. indica confers resistance reminiscent of induced systemic resistance (ISR).

Keywords: Systemic disease resistance - Piriformospora indica - Powdery mildew - NPR1 - Jasmonic Acid - Arabidopsis

1 These two authors contributed equally to this work.

(Received September 9, 2008; Accepted September 30, 2008)
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