The afterlife effects of fungal morphology: Contrasting decomposition rates between diffuse and rhizomorphic necromass

Amanda K. Certano, Christopher W. Fernandez, Katherine A. Heckman, Peter G Kennedy

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Microbial necromass is now recognized as an important input into stable soil organic matter pools in terrestrial ecosystems. While melanin and nitrogen content have been identified as factors that influence the decomposition rate of fungal necromass, the effects of mycelial morphology on necromass decomposition remain largely unknown. Using the fungus Armillaria mellea, which produces both diffuse and rhizomorphic biomass in pure culture, we assessed the effects of necromass morphology on decomposition in a 12 week field experiment in Pinus and Quercus dominated forests in Minnesota, USA. Diffuse and rhizomorphic necromass was incubated for 2, 4, 6, and 12 weeks to assess differences in decay rates and changes in residual necromass chemistry. Rhizomorphic necromass decomposed significantly slower than diffuse necromass in both forest types. This difference was correlated with initial necromass chemistry, particularly nitrogen content, but not with hydrophobicity. Over the course of the incubation, there was a greater change in the chemistry of diffuse versus rhizomorphic necromass, with both becoming more enriched in recalcitrant compounds. Given that many fungi with both saprotrophic and mycorrhizal ecologies produce rhizomorphs, these results suggest that mycelial morphology should be explicitly considered as an important functional trait influencing the rate of fungal necromass decomposition.

Original languageEnglish (US)
Pages (from-to)76-81
Number of pages6
JournalSoil Biology and Biochemistry
Volume126
DOIs
StatePublished - Nov 1 2018

Fingerprint

decomposition
degradation
Armillaria
Fungi
Nitrogen
Quercus
Pinus
Melanins
fungus
Ecology
Hydrophobic and Hydrophilic Interactions
melanin
Biomass
Ecosystem
nitrogen
hydrophobicity
Soil
terrestrial ecosystem
chemistry
soil organic matter

Keywords

  • Carbon cycling
  • Diffuse
  • Mycelial morphology
  • Mycorrhizal fungi
  • Rhizomorphic
  • Saprotroph

Cite this

The afterlife effects of fungal morphology : Contrasting decomposition rates between diffuse and rhizomorphic necromass. / Certano, Amanda K.; Fernandez, Christopher W.; Heckman, Katherine A.; Kennedy, Peter G.

In: Soil Biology and Biochemistry, Vol. 126, 01.11.2018, p. 76-81.

Research output: Contribution to journalArticle

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