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Dialogues of root-colonizing biocontrol pseudomonads

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Abstract

Among biocontrol agents that are able to suppress root diseases caused by fungal pathogens, root-colonizing fluorescent pseudomonads have received particular attention because many strains of these bacteria trigger systemic resistance in host plants and produce antifungal compounds and exoenzymes. In general, the expression of these plant-beneficial traits is regulated by autoinduction mechanisms and may occur on roots when the pseudomonads form microcolonies. Three major classes of antibiotic compounds reviewed here in detail (2,4-diacetylphloroglucinol, pyoluteorin and various phenazine compounds) are all produced under cell population density-dependent autoinduction control acting at transcriptional and post-transcriptional levels. This regulation can either be reinforced or attenuated by a variety of chemical signals emanating from the pseudomonads themselves, other microorganisms or root exudates. Signals stimulating biocontrol factor expression via the Gac/Rsm signal transduction pathway in the biocontrol strain Pseudomonas fluorescens CHA0 are synthesized by many different plant-associated bacteria, warranting a more detailed investigation in the future.

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Abbreviations

AHL:

N-acyl-homoserine lactone

AI-2:

Autoinducer 2

DAPG :

2,4-Diacetylphloroglucinol

HCN:

Hydrogen cyanide

IAA:

Indole-3-acetic acid

PCA:

Phenazine-1-carboxylic acid

PLT:

Pyoluteorin

PQS:

Pseudomonas quinolone signal

QS:

Quorum sensing

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Acknowledgements

We gratefully acknowledge financial support from the Swiss National Science Foundation (projects 3100A0-100180 and 3100A0-105881) and from the State Secretariat for Education and Research (COST project C04.0201).

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  1. Département de Microbiologie Fondamentale, Université de Lausanne, Lausanne, 1015, Switzerland

    Christophe Dubuis, Christoph Keel & Dieter Haas

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Dubuis, C., Keel, C. & Haas, D. Dialogues of root-colonizing biocontrol pseudomonads. Eur J Plant Pathol 119, 311–328 (2007). https://doi.org/10.1007/s10658-007-9157-1

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