An antagonistic driver of the microbial phyllosphere suppresses infection of Arabidopsis thaliana by the oomycete pathogen Albugo laibachii via a secreted hydrolase

BioRxiv : the Preprint Server for Biology
K. EitzenGunther Doehlemann


In natural habitats, plants are challenged by pathogenic organisms, while they are extensively colonized by microbes, which establish a network of interactions with the plant and amongst each other. Therefore, plant immunity might not only be shaped by the co-evolutionary arms race between plants and pathogens, but also be a result from interactions within the microbiota and the host. In wild Arabidopsis thaliana populations, the oomycete pathogen Albugo laibachii has been identified as main driver of the phyllosphere microbiota. In this study, we describe the epiphytic yeast Moesziomyces albugensis and its antagonistic role in the microbial phyllosphere of Arabidopsis thaliana. M. albugensis, a close relative to pathogenic smut fungi, antagonizes several leaf-colonizing microbes. In particular, it prevents infection of A. thaliana by A. laibachii. Combination of transcriptomics and reverse genetics identified a gene of M. albugensis encoding a GH25 hydrolase as major factor of this microbial antagonism. Findings in this study provide identify a potential factor of oomycete biocontrol, provide mechanistic insight in microbial antagonism shaping leaf microbiota and provide new insights in the evolution of epiphytic basidiomycete...Continue Reading

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