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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. Using synthetic communities derived from  C. reinhardtii  and  Arabidopsis thaliana , we show that phycosphere and root bacteria assemble into taxonomically similar 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 suggest the existence of shared ecological principles driving the assembly of the  A. thaliana  root and  C. reinhardtii  phycosphere microbiota, despite the vast evolutionary distance between these two photosynthetic organisms.

Shared features and reciprocal complementation of the Chlamydomonas and Arabidopsis microbiota