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Ectomycorrhizal fungi decompose soil organic matter using oxidative mechanisms adapted from saprotrophic ancestors.

Author:
  • Firoz Shah
  • César Nicolás Cuevas
  • Johan Bentzer
  • Magnus Ellström
  • Mark Smits
  • Francois Rineau
  • Björn Canbäck
  • Dimitrios Floudas
  • Robert Carleer
  • Gerald Lackner
  • Jana Braesel
  • Dirk Hoffmeister
  • Bernard Henrissat
  • Dag Ahrén
  • Tomas Johansson
  • David S Hibbett
  • Francis Martin
  • Per Persson
  • Anders Tunlid
Publishing year: 2016
Language: English
Pages: 1705-1706
Publication/Series: New Phytologist
Volume: 209
Issue: Online 03 November 2015
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

Ectomycorrhizal fungi are thought to have a key role in mobilizing organic nitrogen that is trapped in soil organic matter (SOM). However, the extent to which ectomycorrhizal fungi decompose SOM and the mechanism by which they do so remain unclear, considering that they have lost many genes encoding lignocellulose-degrading enzymes that are present in their saprotrophic ancestors. Spectroscopic analyses and transcriptome profiling were used to examine the mechanisms by which five species of ectomycorrhizal fungi, representing at least four origins of symbiosis, decompose SOM extracted from forest soils. In the presence of glucose and when acquiring nitrogen, all species converted the organic matter in the SOM extract using oxidative mechanisms. The transcriptome expressed during oxidative decomposition has diverged over evolutionary time. Each species expressed a different set of transcripts encoding proteins associated with oxidation of lignocellulose by saprotrophic fungi. The decomposition 'toolbox' has diverged through differences in the regulation of orthologous genes, the formation of new genes by gene duplications, and the recruitment of genes from diverse but functionally similar enzyme families. The capacity to oxidize SOM appears to be common among ectomycorrhizal fungi. We propose that the ancestral decay mechanisms used primarily to obtain carbon have been adapted in symbiosis to scavenge nutrients instead.

Keywords

  • Microbiology

Other

Published
  • MICCS - Molecular Interactions Controlling soil Carbon Sequestration
  • Microbial Ecology
  • ISSN: 1469-8137
Björn Canbäck
E-mail: bjorn [dot] canback [at] biol [dot] lu [dot] se

Senior lecturer

Molecular Cell Biology

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