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

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.

journal_name

PeerJ

journal_title

PeerJ

authors

Lee S,Ishiga Y,Clermont K,Mysore KS

doi

10.7717/peerj.34

subject

Has Abstract

pub_date

2013-02-12 00:00:00

pages

e34

issn

2167-8359

pii

34

journal_volume

1

pub_type

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