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Coronatine inhibits stomatal closure and delays hypersensitive response cell death induced by nonhost bacterial pathogens.

Authors
  • Lee, Seonghee1
  • Ishiga, Yasuhiro
  • Clermont, Kristen
  • Mysore, Kirankumar S
  • 1 The Samuel Roberts Noble Foundation , Plant Biology , Ardmore, Oklahoma , USA.
Type
Published Article
Journal
PeerJ
Publisher
PeerJ
Publication Date
Jan 01, 2013
Volume
1
Identifiers
DOI: 10.7717/peerj.34
PMID: 23638370
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Pseudomonas syringae is the most widespread bacterial pathogen in plants. Several strains of P. syringae produce a phytotoxin, coronatine (COR), which acts as a jasmonic acid mimic and inhibits plant defense responses and contributes to disease symptom development. In this study, we found that COR inhibits early defense responses during nonhost disease resistance. Stomatal closure induced by a nonhost pathogen, P. syringae pv. tabaci, was disrupted by COR in tomato epidermal peels. In addition, nonhost HR cell death triggered by P. syringae pv. tabaci on tomato was remarkably delayed when COR was supplemented along with P. syringae pv. tabaci inoculation. Using isochorismate synthase (ICS)-silenced tomato plants and transcript profiles of genes in SA- and JA-related defense pathways, we show that COR suppresses SA-mediated defense during nonhost resistance.

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