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A fungal member of the microbial phyllosphere antagonizes infection of Arabidopsis thaliana by the oomycete pathogen Albugo laibachii via a putative secreted hydrolase

Katharina Eitzen, Priyamedha Sengupta, Samuel Kroll, Eric Kemen, Gunther Doehlemann
doi: https://doi.org/10.1101/2020.04.20.051367
Katharina Eitzen
1Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Center for Molecular Biosciences, Zuelpicher Str. 47a, 50674 Cologne, Germany
2Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
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Priyamedha Sengupta
1Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Center for Molecular Biosciences, Zuelpicher Str. 47a, 50674 Cologne, Germany
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Samuel Kroll
2Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
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Eric Kemen
2Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, 50829 Köln, Germany
3Department of Microbial Interactions, IMIT/ZMBP, University of Tübingen, Tübingen, Germany
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  • For correspondence: eric.kemen@uni-tuebingen.de g.doehlemann@uni-koeln.de
Gunther Doehlemann
1Institute for Plant Sciences and Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Center for Molecular Biosciences, Zuelpicher Str. 47a, 50674 Cologne, Germany
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  • For correspondence: eric.kemen@uni-tuebingen.de g.doehlemann@uni-koeln.de
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Abstract

In natural habitats, plants are not only challenged by pathogenic organisms, but also extensively colonized by commensal microbes. The network of interactions that these microbes establish with their host and amongst each other has been suggested to contribute to the immune responses of plants against pathogens. In wild Arabidopsis thaliana populations, the oomycete pathogen Albugo laibachii has been shown to play an influential role in structuring the microbial communities of the leaf surface, known as phyllosphere. In this study, we show that the epiphytic yeast Moesziomyces albugensis, a close relative of pathogenic smut fungi, plays an antagonistic role in the microbial phyllosphere of Arabidopsis thaliana. In particular, M. albugensis prevents infection of A. thaliana by A. laibachii. Through a combination of transcriptome analysis and reverse genetics we identified a gene encoding a putative GH25 hydrolase as the major effector of the microbial antagonism of M. albugensis. Our findings broaden the understanding of microbial interactions within the phyllosphere, provide insights into the evolution of epiphytic basidiomycete yeasts and pave the way for the development of novel biocontrol strategies.

Competing Interest Statement

The authors have declared no competing interest.

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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 May 18, 2020.
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A fungal member of the microbial phyllosphere antagonizes infection of Arabidopsis thaliana by the oomycete pathogen Albugo laibachii via a putative secreted hydrolase
Katharina Eitzen, Priyamedha Sengupta, Samuel Kroll, Eric Kemen, Gunther Doehlemann
bioRxiv 2020.04.20.051367; doi: https://doi.org/10.1101/2020.04.20.051367
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A fungal member of the microbial phyllosphere antagonizes infection of Arabidopsis thaliana by the oomycete pathogen Albugo laibachii via a putative secreted hydrolase
Katharina Eitzen, Priyamedha Sengupta, Samuel Kroll, Eric Kemen, Gunther Doehlemann
bioRxiv 2020.04.20.051367; doi: https://doi.org/10.1101/2020.04.20.051367

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