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Pattern-Triggered Immunity And Cell Wall Integrity Maintenance Jointly Modulate Plant Stress Responses

Timo Engelsdorf, Nora Gigli-Bisceglia, Manikandan Veerabagu, Joseph F. McKenna, Frauke Augstein, Dieuwertje van der Does, Cyril Zipfel, Thorsten Hamann
doi: https://doi.org/10.1101/130013
Timo Engelsdorf
NTNU, Department of Biology, Hogskoleringen 5, Realfagbygget;
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Nora Gigli-Bisceglia
NTNU, Department of Biology, Hogskoleringen 5, Realfagbygget;
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Manikandan Veerabagu
NTNU, Department of Biology, Hogskoleringen 5, Realfagbygget;
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Joseph F. McKenna
Department of Biology, S209A Sinclair, Gypsy Lane, Oxford Brookes University, Oxford, UK;
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Frauke Augstein
Institute for Organismal Biology, Physiological Botany, Uppsala University, 75651 Uppsala;
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Dieuwertje van der Does
The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
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Cyril Zipfel
The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
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Thorsten Hamann
NTNU, Department of Biology, Hogskoleringen 5, Realfagbygget;
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  • For correspondence: thorsten.hamann@ntnu.no
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Abstract

Plant cells are surrounded by walls, which must often meet opposing functional requirements during plant growth and defense. The cells meet them by modifying wall structure and composition in a tightly controlled and adaptive manner. The modifications seem to be mediated by a dedicated cell wall integrity (CWI) maintenance mechanism. Currently the mode of action of the mechanism is not understood and it is unclear how its activity is coordinated with established plant defense signaling. We investigated responses to induced cell wall damage (CWD) impairing CWI and the underlying mechanism in Arabidopsis thaliana. Interestingly inhibitor- and enzyme-derived CWD induced similar, turgor-sensitive stress responses. Genetic analysis showed that the receptor-like kinase (RLK) FEI2 and the mechano-sensitive, plasma membrane-localized Ca2+- channel MCA1 function downstream of the THE1 RLK in CWD perception. Phenotypic clustering with 27 genotypes identified a core group of RLKs and ion channels, required for activation of CWD responses. By contrast, the responses were repressed by pattern-triggered immune (PTI) signaling components including PEPR1 and 2, the receptors for the immune signaling peptide AtPep1. Interestingly AtPep1 application repressed CWD-induced phytohormone accumulation in a PEPR1/2-dependent manner. These results suggest that PTI suppresses CWD-induced defense responses through elicitor peptide-mediated signaling during defense response activation. If PTI is impaired, the suppression of CWD-induced responses is alleviated, thus compensating for defective PTI.

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Posted June 26, 2017.
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Pattern-Triggered Immunity And Cell Wall Integrity Maintenance Jointly Modulate Plant Stress Responses
Timo Engelsdorf, Nora Gigli-Bisceglia, Manikandan Veerabagu, Joseph F. McKenna, Frauke Augstein, Dieuwertje van der Does, Cyril Zipfel, Thorsten Hamann
bioRxiv 130013; doi: https://doi.org/10.1101/130013
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Pattern-Triggered Immunity And Cell Wall Integrity Maintenance Jointly Modulate Plant Stress Responses
Timo Engelsdorf, Nora Gigli-Bisceglia, Manikandan Veerabagu, Joseph F. McKenna, Frauke Augstein, Dieuwertje van der Does, Cyril Zipfel, Thorsten Hamann
bioRxiv 130013; doi: https://doi.org/10.1101/130013

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