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Plant and Cell Physiology Advance Access originally published online on October 7, 2008
Plant and Cell Physiology 2008 49(11):1747-1751; 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 email: journals.permissions@oxfordjournals.org

Short Communication

Systemic Resistance in Arabidopsis Conferred by the Mycorrhizal Fungus Piriformospora indica Requires Jasmonic Acid Signaling and the Cytoplasmic Function of NPR1

Elke Stein1,2, Alexandra Molitor1,2, Karl-Heinz Kogel1,* and Frank Waller1

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

*Corresponding author: E-mail, Karl-Heinz.Kogel{at}agrar.uni-giessen.de; Fax, +49-641-99-37499.


  Abstract

We analyzed the requirement of specific defense pathways for powdery mildew (Golovinomyces orontii) resistance induced by the basidiomycete Piriformospora indica in Arabidopsis. Piriformospora indica root colonization reduced G. orontii conidia in wild-type (Col-0), npr1-3 (nonexpressor of PR genes 1-3) 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 non-responsive 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: Arabidopsis - Jasmonic Acid - NPR1 - Piriformospora indica - Powdery mildew - Systemic disease resistance

Abbreviations: dpi, days post-inoculation; ERF1, ethylene response factor 1; ET, ethylene; ISR, induced systemic resistance; JA, jasmonic acid; LOX2, lipoxygenase 2; MeJA, methyl jasmonate; PDF1.2, plant defensin 1.2; PR, pathogenesis related; Q-PCR, quantitative PCR; SA, salicylic acid; SAR, systemic acquired resistance; VSP, vegetative storage protein.

2These authors contributed equally to this work.

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