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Open Access Publications from the University of California

Comparative genomics reveals unique wood-decay strategies and fruiting body development in the Schizophyllaceae.

  • Author(s): Almási, Éva;
  • Sahu, Neha;
  • Krizsán, Krisztina;
  • Bálint, Balázs;
  • Kovács, Gábor M;
  • Kiss, Brigitta;
  • Cseklye, Judit;
  • Drula, Elodie;
  • Henrissat, Bernard;
  • Nagy, István;
  • Chovatia, Mansi;
  • Adam, Catherine;
  • LaButti, Kurt;
  • Lipzen, Anna;
  • Riley, Robert;
  • Grigoriev, Igor V;
  • Nagy, László G
  • et al.

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Agaricomycetes are fruiting body-forming fungi that produce some of the most efficient enzyme systems to degrade wood. Despite decades-long interest in their biology, the evolution and functional diversity of both wood-decay and fruiting body formation are incompletely known. We performed comparative genomic and transcriptomic analyses of wood-decay and fruiting body development in Auriculariopsis ampla and Schizophyllum commune (Schizophyllaceae), species with secondarily simplified morphologies, an enigmatic wood-decay strategy and weak pathogenicity to woody plants. The plant cell wall-degrading enzyme repertoires of Schizophyllaceae are transitional between those of white rot species and less efficient wood-degraders such as brown rot or mycorrhizal fungi. Rich repertoires of suberinase and tannase genes were found in both species, with tannases restricted to Agaricomycetes that preferentially colonize bark-covered wood, suggesting potential complementation of their weaker wood-decaying abilities and adaptations to wood colonization through the bark. Fruiting body transcriptomes revealed a high rate of divergence in developmental gene expression, but also several genes with conserved expression patterns, including novel transcription factors and small-secreted proteins, some of the latter which might represent fruiting body effectors. Taken together, our analyses highlighted novel aspects of wood-decay and fruiting body development in an important family of mushroom-forming fungi.

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