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Bacterial biofilm formation on soil fungi: a widespread ability under controls

Cora Miquel Guennoc, Christophe Rose, Jessy Labbé, Aurélie Deveau
doi: https://doi.org/10.1101/130740
Cora Miquel Guennoc
1INRA Université de Lorraine, Interactions Arbres-Microorganismes, UMR 1136, Champenoux, F-54280, France
2Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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Christophe Rose
3INRA Université de Lorraine, Ecologie et Ecophysiologie Forestière, UMR 1137, Champenoux, F-54280, France
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Jessy Labbé
2Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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Aurélie Deveau
1INRA Université de Lorraine, Interactions Arbres-Microorganismes, UMR 1136, Champenoux, F-54280, France
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  • For correspondence: aurelie.deveau@inra.fr
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Abstract

In natural environments, bacteria preferentially live in biofilms that they build on abiotic surfaces but also on living tissues. Although fungi form extensive networks of hyphae within soils and thus could provide immense surfaces for bacteria to build biofilms and to proliferate, the extent on such phenomenon and the consequences for the fitness of both microorganisms is poorly known in soils. Here, we analyzed the process of formation of biofilms by various bacteria on hyphae of soil fungi in an in vitro setting using confocal and electron microscopy. We showed that the ability to form biofilms on fungal hyphae is widely shared among soil bacteria. In contrast, some fungi, mainly belonging to the Ascomycete class, did not allow for the formation of bacterial biofilms on their surfaces. The formation of biofilms was also strongly modulated by the presence of tree roots and by the development of the ectomycorrhizal symbiosis, suggesting that biofilm formation does not occur randomly in soil but that it is highly regulated by several biotic factors. Finally, our study led to the unexpected finding that networks of filaments made of extracellular DNA were used to build the skeleton of biofilms by a large array of bacteria.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted April 28, 2017.
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Bacterial biofilm formation on soil fungi: a widespread ability under controls
Cora Miquel Guennoc, Christophe Rose, Jessy Labbé, Aurélie Deveau
bioRxiv 130740; doi: https://doi.org/10.1101/130740
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Bacterial biofilm formation on soil fungi: a widespread ability under controls
Cora Miquel Guennoc, Christophe Rose, Jessy Labbé, Aurélie Deveau
bioRxiv 130740; doi: https://doi.org/10.1101/130740

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