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Nuclear Activity of MLA Immune Receptors Links Isolate-Specific and Basal Disease-Resistance Responses
Qian-Hua Shen,1
Yusuke Saijo,1
Stefan Mauch,1
Christoph Biskup,2
Stéphane Bieri,3
Beat Keller,3
Hikaru Seki,1*
Bekir Ülker,1
Imre E. Somssich,1
Paul Schulze-Lefert1
Abstract:
Plant immune responses are triggered by pattern recognitionreceptors that detect conserved pathogen-associated molecularpatterns (PAMPs) or by resistance (R) proteins recognizing isolate-specificpathogen effectors. We show that in barley, intracellular mildewA (MLA) R proteins function in the nucleus to confer resistanceagainst the powdery mildew fungus. Recognition of the fungalavirulence A10 effector by MLA10 induces nuclear associationsbetween receptor and WRKY transcription factors. The identifiedWRKY proteins act as repressors of PAMP-triggered basal defense.MLA appears to interfere with the WRKY repressor function, therebyde-repressing PAMP-triggered basal defense. Our findings reveala mechanism by which these polymorphic immune receptors integratedistinct pathogen signals.
1 Department of Plant Microbe Interactions, Max-Planck-Institut für Züchtungsforschung, Carl-von-Linné-Weg 10, D-50829 Köln, Germany. 2 Institute of Physiology II, Friedrich-Schiller-University of Jena, Teichgraben 8, D-07740 Jena, Germany. 3 Institute of Plant Biology, University of Zürich, Zollikerstrasse 107, 8008 Zürich, Switzerland.
Present address: School of Biological and Biomedical Sciences,Durham University, Science Site, South Road, Durham DH1 3LE,UK.
To whom correspondence should be addressed. E-mail: schlef{at}mpiz-koeln.mpg.de
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