| Popis: |
Plants are not only challenged by pathogenic organisms, but also colonized by commensal microbes. The network of interactions these microbes establish with their host and amongst each other is suggested to contribute to the immune responses of plants against pathogens. In wildArabidopsis thalianapopulations, the oomycete pathogenAlbugo laibachiihas been shown to play an influential role in structuring the leaf phyllosphere. We show that the epiphytic yeastMoesziomyces bullatusexAlbugoonArabidopsis,a close relative of pathogenic smut fungi, is an antagonistic member of theA. thalianaphyllosphere, which reduces infection ofA. thalianabyA. laibachii. Combination of transcriptome analysis, reverse genetics and protein characterization identified a GH25 hydrolase with lysozyme activity as the major effector of this microbial antagonism. 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. |
