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Characterization of the Chlamydomonas reinhardtii phycosphere reveals conserved features of the plant microbiota

Paloma Durán, José Flores-Uribe, Kathrin Wippel, Pengfan Zhang, Rui Guan, View ORCID ProfileRuben Garrido-Oter
doi: https://doi.org/10.1101/2021.03.04.433956
Paloma Durán
1Department of Plant-Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
2Cluster of Excellence on Plant Sciences, 40225 Düsseldorf, Germany
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José Flores-Uribe
1Department of Plant-Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
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Kathrin Wippel
1Department of Plant-Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
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Pengfan Zhang
1Department of Plant-Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
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Rui Guan
1Department of Plant-Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
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Ruben Garrido-Oter
1Department of Plant-Microbe Interactions, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
2Cluster of Excellence on Plant Sciences, 40225 Düsseldorf, Germany
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  • ORCID record for Ruben Garrido-Oter
  • For correspondence: garridoo@mpipz.mpg.de
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Abstract

Microscopic algae release organic compounds to the region immediately surrounding their cells, known as the phycosphere, constituting a niche for colonization by heterotrophic bacteria. These bacteria take up algal photoassimilates and provide beneficial functions to their host, in a process that resembles the establishment of microbial communities associated with the roots and rhizospheres of land plants. Here, we characterize the microbiota of the model alga Chlamydomonas reinhardtii and reveal extensive taxonomic and functional overlap with the root microbiota of land plants. Reconstitution experiments using synthetic communities derived from C. reinhardtii and Arabidopsis thaliana show that phycosphere and root bacteria assemble into taxonomically equivalent communities on either host. We show that provision of diffusible metabolites is not sufficient for phycosphere community establishment, which additionally requires physical proximity to the host. Our data suggests that the microbiota of photosynthetic organisms, including green algae and flowering plants, assembles according to core ecological principles.

Competing Interest Statement

The authors have declared no competing interest.

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  • ↵† Co-first authors

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Posted March 04, 2021.
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Characterization of the Chlamydomonas reinhardtii phycosphere reveals conserved features of the plant microbiota
Paloma Durán, José Flores-Uribe, Kathrin Wippel, Pengfan Zhang, Rui Guan, Ruben Garrido-Oter
bioRxiv 2021.03.04.433956; doi: https://doi.org/10.1101/2021.03.04.433956
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Characterization of the Chlamydomonas reinhardtii phycosphere reveals conserved features of the plant microbiota
Paloma Durán, José Flores-Uribe, Kathrin Wippel, Pengfan Zhang, Rui Guan, Ruben Garrido-Oter
bioRxiv 2021.03.04.433956; doi: https://doi.org/10.1101/2021.03.04.433956

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