Role of secondary metabolites in the interaction between Pseudomonas fluorescensand soil microorganisms under iron-limited conditions
2016
Deveau, Aurélie | Gross, Harald | Palin, Béatrice | Mehnaz, Samina | Schnepf, Max | Leblond, Pierre | Dorrestein, Pieter C. | Aigle, Bertrand | Interactions Arbres-Microorganismes (IAM) ; Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) | Eberhard Karls Universität Tübingen = University of Tübingen | Dynamique des Génomes et Adaptation Microbienne (DynAMic) ; Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) | University of California [San Diego] (UC San Diego) ; University of California (UC) | French National Research Agency through the Laboratory of Excellence ARBRE (ANR-11-LABX-0002-01) ; US Department of Energy, Office of Science, Biological and Environmental Research (DE6AC05-00OR22725) ; Deutsche Forschungsgemeinschaft (GR 2673/2-1) ; Georg Forster Fellowship ; NIH (GMS10RR029121) | ANR-11-LABX-0002,ARBRE,Recherches Avancées sur l'Arbre et les Ecosytèmes Forestiers(2011)
Microorganisms can be versatile in their interactions with each other, being variously beneficial, neutral or antagonistic in their effect. Although this versatility has been observed among many microorganisms and in many environments, little is known regarding the mechanisms leading to these changes in behavior. In the present work, we analyzed the mechanism by which the soil bacterium Pseudomonas fluorescens BBc6R8 shifts from stimulating the growth of the ectomycorrhizal fungus Laccaria bicolor S238N to killing the fungus. We show that among the three secondary metabolites produced by the bacterial strain-the siderophores enantio-pyochelin and pyoverdine, and the biosurfactant viscosin-the siderophores are mainly responsible for the antagonistic activity of the bacterium under iron-limited conditions. While the bacterial strain continues to produce beneficial factors, their effects are overridden by the action of their siderophores. This antagonistic activity of the strain P. fluorescens BBC6R8 in iron-depleted environments is not restricted to its influence on L. bicolor, since it was also seen to inhibit the growth of the actinomycete Streptomyces ambofaciens ATCC23877. We show that the strain P. fluorescens BBc6R8 uses different strategies to acquire iron, depending on certain biotic and abiotic factors.Pseudomonas fluorescens produces several secondary metabolites in its interactions with soil fungi and bacteria, and shifts from being mutualistic to antagonist under iron-limited conditions.Pseudomonas fluorescens produces several secondary metabolites in its interactions with soil fungi and bacteria, and shifts from being mutualistic to antagonist under iron-limited conditions.
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