Document Detail

The HrpN(ea) harpin from Erwinia amylovora triggers differential responses on the nonhost Arabidopsis thaliana cells and on the host apple cells.
MedLine Citation:
PMID:  17249426     Owner:  NLM     Status:  MEDLINE    
Erwinia amylovora is a gram-negative necrogenic bacterium causing fire blight of the Maloideae subfamily of Rosaceae such as apple and pear. It provokes progressive necrosis in aerial parts of susceptible host plants (compatible interaction) and a hypersensitive reaction (HR) when infiltrated in nonhost plants (incompatible interaction). The HrpN(ea) harpin is a type three secretion system effector secreted by E. amylovora. This protein is involved in pathogenicity and HR-eliciting capacity of E. amylovora. In the present study, we showed that, in nonhost Arabidopsis thaliana cells, purified HrpN(ea) induces cell death and H2O2 production, two nonhost resistance responses, but failed to induce such responses in host MM106 apple cells. Moreover, HrpN(ea) induced an increase in anion current in host MM106 apple cells, at the opposite of the decrease of anion current previously shown to be necessary to induce cell death in nonhost A. thaliana cells. These results suggest that HrpN(ea) induced different signaling pathways, which could account for early induced compatible or incompatible interaction development.
David Reboutier; Cécile Frankart; Joël Briand; Bernadette Biligui; Sandrine Laroche; Jean-Pierre Rona; Marie-Anne Barny; François Bouteau
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Molecular plant-microbe interactions : MPMI     Volume:  20     ISSN:  0894-0282     ISO Abbreviation:  Mol. Plant Microbe Interact.     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-01-25     Completed Date:  2007-05-21     Revised Date:  2011-01-07    
Medline Journal Info:
Nlm Unique ID:  9107902     Medline TA:  Mol Plant Microbe Interact     Country:  United States    
Other Details:
Languages:  eng     Pagination:  94-100     Citation Subset:  IM    
LEM, EA 3514, Université Paris 7, Case 7069, 2 place Jussieu, 75251 Paris 5, France.
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MeSH Terms
Arabidopsis / cytology,  drug effects*,  microbiology
Bacterial Outer Membrane Proteins / genetics,  pharmacology*
Bacterial Proteins / genetics,  pharmacology
Cell Division / drug effects
Dose-Response Relationship, Drug
Erwinia amylovora / genetics,  metabolism*,  pathogenicity
Malus / cytology,  drug effects*,  microbiology
Pesticides / pharmacology
Potassium Channels / drug effects,  physiology
Reg. No./Substance:
0/Bacterial Outer Membrane Proteins; 0/Bacterial Proteins; 0/Pesticides; 0/Potassium Channels; 0/harpin protein, Erwinia amylovora

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