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Per Persson. Foto.

Per Persson

Dekan

Per Persson. Foto.

The soil organic matter decomposition mechanisms in ectomycorrhizal fungi are tuned for liberating soil organic nitrogen

Författare

  • César Nicolás
  • Tomas Martin-Bertelsen
  • Dimitrios Floudas
  • Johan Bentzer
  • Mark Smits
  • Tomas Johansson
  • Carl Troein
  • Per Persson
  • Anders Tunlid

Summary, in English

Many trees form ectomycorrhizal symbiosis with fungi. During symbiosis, the tree roots supply sugar to the fungi in exchange for nitrogen, and this process is critical for the nitrogen and carbon cycles in forest ecosystems. However, the extents to which ectomycorrhizal fungi can liberate nitrogen and modify the soil organic matter and the mechanisms by which they do so remain unclear since they have lost many enzymes for litter decomposition that were present in their free-living, saprotrophic ancestors. Using time-series spectroscopy and transcriptomics, we examined the ability of two ectomycorrhizal fungi from two independently evolved ectomycorrhizal lineages to mobilize soil organic nitrogen. Both species oxidized the organic matter and accessed the organic nitrogen. The expression of those events was controlled by the availability of glucose and inorganic nitrogen. Despite those similarities, the decomposition mechanisms, including the type of genes involved as well as the patterns of their expression, differed markedly between the two species. Our results suggest that in agreement with their diverse evolutionary origins, ectomycorrhizal fungi use different decomposition mechanisms to access organic nitrogen entrapped in soil organic matter. The timing and magnitude of the expression of the decomposition activity can be controlled by the below-ground nitrogen quality and the above-ground carbon supply.

Avdelning/ar

  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • Mikrobiologisk ekologi
  • MEMEG
  • Beräkningsbiologi och biologisk fysik - Genomgår omorganisation
  • Centrum för miljö- och klimatvetenskap (CEC)

Publiceringsår

2018-12-11

Språk

Engelska

Publikation/Tidskrift/Serie

ISME Journal

Dokumenttyp

Artikel i tidskrift

Förlag

Nature Publishing Group

Ämne

  • Microbiology
  • Ecology
  • Other Physics Topics

Status

Published

Projekt

  • MICCS - Molecular Interactions Controlling soil Carbon Sequestration

Forskningsgrupp

  • Microbial Ecology

ISBN/ISSN/Övrigt

  • ISSN: 1751-7362