Dataset Information

Draft Genome Sequences of Three Isolates of Golubevia sp. Basidiomycete Fungi Isolated from Powdery Mildew Pustules.

ABSTRACT: The genomes of three Golubevia isolates (BC0812, BC0850, and BC0902) that have been shown to reduce conidiation of Blumeria graminis f. sp. tritici were sequenced using a dual-platform approach. The assembled genomes will help to elucidate the molecular mechanisms underlying the biocontrol effect of this understudied group.

SUBMITTER: Russ L

PROVIDER: S-EPMC7272565 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Publications

Draft Genome Sequences of Three Isolates of Golubevia sp. Basidiomycete Fungi Isolated from Powdery Mildew Pustules.

Russ Lina L Warris Sven S Lombaers-van der Plas Carin C Groenenboom-de Haas Lia H LH Cordewener Jan H G JHG Schijlen Elio E Köhl Jürgen J

Microbiology resource announcements 20200604 23

The genomes of three Golubevia isolates (BC0812, BC0850, and BC0902) that have been shown to reduce conidiation of Blumeria graminis f. sp. tritici were sequenced using a dual-platform approach. The assembled genomes will help to elucidate the molecular mechanisms underlying the biocontrol effect of this understudied group. ...[more]

PMID: 32499356

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Project description:Due to their comparatively small genome size and short generation time, fungi are exquisite model systems to study eukaryotic genome evolution. Powdery mildew fungi present an exceptional case because of their strict host dependency (termed obligate biotrophy) and the atypical size of their genomes (>100 Mb). This size expansion is largely due to the pervasiveness of transposable elements on 70% of the genome and is associated with the loss of multiple conserved ascomycete genes required for a free-living lifestyle. To date, little is known about the mechanisms that drove these changes, and information on ancestral powdery mildew genomes is lacking. We report genome analysis of the early-diverged and exclusively sexually reproducing powdery mildew fungus Parauncinula polyspora, which we performed on the basis of a natural leaf epiphytic metapopulation sample. In contrast to other sequenced species of this taxonomic group, the assembled P. polyspora draft genome is surprisingly small (<30 Mb), has a higher content of conserved ascomycete genes, and is sparsely equipped with transposons (<10%), despite the conserved absence of a common defense mechanism involved in constraining repetitive elements. We speculate that transposable element spread might have been limited by this pathogen's unique reproduction strategy and host features and further hypothesize that the loss of conserved ascomycete genes may promote the evolutionary isolation and host niche specialization of powdery mildew fungi. Limitations associated with this evolutionary trajectory might have been in part counteracted by the evolution of plastic, transposon-rich genomes and/or the expansion of gene families encoding secreted virulence proteins.IMPORTANCE Powdery mildew fungi are widespread and agronomically relevant phytopathogens causing major yield losses. Their genomes have disproportionately large numbers of mobile genetic elements, and they have experienced a significant loss of highly conserved fungal genes. In order to learn more about the evolutionary history of this fungal group, we explored the genome of an Asian oak tree pathogen, Parauncinula polyspora, a species that diverged early during evolution from the remaining powdery mildew fungi. We found that the P. polyspora draft genome is comparatively compact, has a low number of protein-coding genes, and, despite the absence of a dedicated genome defense system, lacks the massive proliferation of repetitive sequences. Based on these findings, we infer an evolutionary trajectory that shaped the genomes of powdery mildew fungi.

Dataset Information

Draft Genome Sequences of Three Isolates of Golubevia sp. Basidiomycete Fungi Isolated from Powdery Mildew Pustules.

Publications

Draft Genome Sequences of Three Isolates of <i>Golubevia</i> sp. Basidiomycete Fungi Isolated from Powdery Mildew Pustules.

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