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<p>Basidiomycete fungi are the main decomposers of dead wood with an impact on the global carbon cycle. Their degradative mechanisms have been well-studied under aerobic conditions. Here, we study their activity in oxygen-depleted environments. We use metaproteomics in a field study to identify active wood-decomposing fungi and their enzymes at different depths from the wood surface, including in oxygen-depleted conditions. In vitro, we observe that the brown-rot fungus <i>Fomitopsis pinicola</i> can grow on wood in complete anoxia. Using <sup>13</sup>C solid-state NMR, we demonstrate the degradation of plant cell-wall polysaccharides and fungal growth in the absence of oxygen. Proteomic analyses reveal that <i>F. pinicola</i> switches from a Fenton chemistry-based process under aerobic conditions to the secretion of plant cell wall-active enzymes in anoxia. Our finding that wood decay fungi can thrive in complete anoxia provides a deeper understanding of lignocellulose degradation mechanisms in nature and raises opportunities for the development of bio-inspired anaerobic processes.</p>

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Wood decay under anoxia by the brown-rot fungus Fomitopsis pinicola

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月9日

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  • Robert Röllig,
  • Annie Lebreton,
  • Lucia Grenga,
  • Rosalie Cresswell,
  • Signe Lett,
  • Theodora Tryfona,
  • David Navarro,
  • Julien Lambert,
  • Sacha Grisel,
  • Isabelle Gimbert,
  • Helle Jakobe Martens,
  • Guylaine Miotello,
  • Xiaolan Yu,
  • Elodie Drula,
  • Marie-Noelle Rosso,
  • Lionel Tarrago,
  • Bernard Henrissat,
  • Katja Johansen,
  • Ray Dupree,
  • Jean Armengaud,
  • Paul Dupree,
  • Jean-Guy Berrin

摘要

Basidiomycete fungi are the main decomposers of dead wood with an impact on the global carbon cycle. Their degradative mechanisms have been well-studied under aerobic conditions. Here, we study their activity in oxygen-depleted environments. We use metaproteomics in a field study to identify active wood-decomposing fungi and their enzymes at different depths from the wood surface, including in oxygen-depleted conditions. In vitro, we observe that the brown-rot fungus Fomitopsis pinicola can grow on wood in complete anoxia. Using 13C solid-state NMR, we demonstrate the degradation of plant cell-wall polysaccharides and fungal growth in the absence of oxygen. Proteomic analyses reveal that F. pinicola switches from a Fenton chemistry-based process under aerobic conditions to the secretion of plant cell wall-active enzymes in anoxia. Our finding that wood decay fungi can thrive in complete anoxia provides a deeper understanding of lignocellulose degradation mechanisms in nature and raises opportunities for the development of bio-inspired anaerobic processes.