A Lectin Receptor-Like Kinase Mediates Pattern-Triggered Salicylic Acid Signaling

Plant surface-localized pathogen recognition receptors (PRRs) perceive conserved microbial features, termed pathogen-associated molecular patterns (PAMPs), resulting in disease resistance. PAMP perception leads to calcium influx, MAPK activation, a burst of reactive oxygen species (ROS) mediated by...

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Published in:Plant physiology (Bethesda) 2017-08, Vol.174 (4), p.2501-2514
Main Authors: Luo, Xuming, Xu, Ning, Huang, Junkai, Gao, Feng, Zou, Huasong, Boudsocq, Marie, Coaker, Gitta, Liu, Jun
Format: Article
Language:English
Subjects:
Arabidopsis - enzymology
Arabidopsis - genetics
Arabidopsis - immunology
Arabidopsis - microbiology
Arabidopsis Proteins - metabolism
Cell Death
Disease Resistance
Flagellin - metabolism
Gene Expression Regulation, Plant
Lectins - metabolism
Life Sciences
Models, Biological
Mutation - genetics
Phenotype
Phosphorylation
Plant Diseases - microbiology
Plant Immunity
Protein Binding
Protein Kinases - metabolism
Protein-Serine-Threonine Kinases - metabolism
Pseudomonas syringae - physiology
Salicylic Acid - metabolism
Signal Transduction
SIGNALING AND RESPONSE
Vegetal Biology
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Summary:Plant surface-localized pathogen recognition receptors (PRRs) perceive conserved microbial features, termed pathogen-associated molecular patterns (PAMPs), resulting in disease resistance. PAMP perception leads to calcium influx, MAPK activation, a burst of reactive oxygen species (ROS) mediated by RbohD, accumulation of the defense hormone salicylic acid (SA), and callose deposition. Lectin receptor-like kinases (LecRKs) belong to a specific PRR family and are important players in plant innate immunity. Here, we report that LecRK-IX.2 is a positive regulator of PRR-triggered immunity. Pathogen infection activated the transcription of Arabidopsis (Arabidopsis thaliana) LecRK-IX.2, and the LecRK-IX.2 knockout lines exhibited enhanced susceptibility to virulent Pseudomonas syringae pv tomato DC3000. In addition, LecRK-IX.2 is capable of inducing RbohD phosphorylation, likely by recruiting calcium-dependent protein kinases to trigger ROS production in Arabidopsis. Overexpression of LecRK-IX.2 resulted in elevated ROS and SAand enhanced systemic acquired resistance to P. syringae pv tomato DC3000. Our data highlight the importance of LecRKs in plant immune signaling and SA accumulation.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.17.00404