Potential role of pathogen signaling in multitrophic plant-microbe interactions involved in disease protection.

Détails

ID Serval
serval:BIB_8E067FE52A62
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Potential role of pathogen signaling in multitrophic plant-microbe interactions involved in disease protection.
Périodique
Applied and Environmental Microbiology
Auteur(s)
Duffy B., Keel C., Défago G.
ISSN
0099-2240[print], 0099-2240[linking]
Statut éditorial
Publié
Date de publication
2004
Volume
70
Numéro
3
Pages
1836-1842
Langue
anglais
Résumé
Multitrophic interactions mediate the ability of fungal pathogens to cause plant disease and the ability of bacterial antagonists to suppress disease. Antibiotic production by antagonists, which contributes to disease suppression, is known to be modulated by abiotic and host plant environmental conditions. Here, we demonstrate that a pathogen metabolite functions as a negative signal for bacterial antibiotic biosynthesis, which can determine the relative importance of biological control mechanisms available to antagonists and which may also influence fungus-bacterium ecological interactions. We found that production of the polyketide antibiotic 2,4-diacetylphloroglucinol (DAPG) was the primary biocontrol mechanism of Pseudomonas fluorescens strain Q2-87 against Fusarium oxysporum f. sp. radicis-lycopersici on the tomato as determined with mutational analysis. In contrast, DAPG was not important for the less-disease-suppressive strain CHA0. This was explained by differential sensitivity of the bacteria to fusaric acid, a pathogen phyto- and mycotoxin that specifically blocked DAPG biosynthesis in strain CHA0 but not in strain Q2-87. In CHA0, hydrogen cyanide, a biocide not repressed by fusaric acid, played a more important role in disease suppression.
Mots-clé
Anti-Bacterial Agents/biosynthesis, Ecosystem, Fusaric Acid/pharmacology, Fusarium/pathogenicity, Gene Expression/drug effects, Genes, Bacterial, Lycopersicon esculentum/microbiology, Pest Control, Biological, Phloroglucinol/analogs & derivatives, Phloroglucinol/metabolism, Plant Diseases/microbiology, Plants/microbiology, Pseudomonas fluorescens/genetics, Pseudomonas fluorescens/metabolism, Signal Transduction
Pubmed
Web of science
Création de la notice
24/01/2008 14:51
Dernière modification de la notice
03/03/2018 19:17
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