The function of melanin in the ectomycorrhizal fungus Cenococcum geophilum under water stress

Christopher W. Fernandez, Roger T. Koide

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

Despite the ubiquity and importance of ectomycorrhizal fungi to ecosystem function, our understanding of their functional ecology remains poor. The highly melanized and common ectomycorrhizal fungus, Cenococcum geophilum, is drought tolerant and abundant in water-stressed habitats, yet the responsible functional traits have not been identified. The production of melanin, a class of complex dark polymers found in fungal cell walls, may be a key functional trait to water stress tolerance. To test this hypothesis, we devised a series of experiments determining the effect of the melanin biosynthesis inhibitor, tricyclazole, on response to osmotic and desiccation stresses. Melanin inhibition only had negative effects on growth when C. geophilum isolates were subjected to osmotic and desiccation stress (-1.7MPa and desiccated) but not under control conditions (-0.01MPa and non-desiccated). This suggests that melanin production is an important functional trait that contributes to water stress tolerance of this cosmopolitan ectomycorrhizal fungus.

Original languageEnglish (US)
Pages (from-to)479-486
Number of pages8
JournalFungal Ecology
Volume6
Issue number6
DOIs
StatePublished - Dec 1 2013

Keywords

  • Cenococcum geophilum
  • Ectomycorrhizal fungi
  • Functional traits
  • Melanin
  • Water stress tolerance

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