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Ectomycorrhizal Cortinarius species participate in enzymatic oxidation of humus in northern forest ecosystems
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2014 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 203, no 1, p. 245-256Article in journal (Refereed) Published
Abstract [en]

* In northern forests, belowground sequestration of nitrogen (N) in complex organic pools restricts nutrient availability to plants. Oxidative extracellular enzymes produced by ectomycorrhizal fungi may aid plant N acquisition by providing access to N in macromolecular complexes. We test the hypotheses that ectomycorrhizal Cortinarius species produce Mn-dependent peroxidases, and that the activity of these enzymes declines at elevated concentrations of inorganic N. * In a boreal pine forest and a sub-arctic birch forest, Cortinarius DNA was assessed by 454-sequencing of ITS amplicons and related to Mn-peroxidase activity in humus samples with- and without previous N amendment. Transcription of Cortinarius Mn-peroxidase genes was investigated in field samples. Phylogenetic analyses of Cortinarius peroxidase amplicons and genome sequences were performed. * We found a significant co-localization of high peroxidase activity and DNA from Cortinarius species. Peroxidase activity was reduced by high ammonium concentrations. Amplification of mRNA sequences indicated transcription of Cortinarius Mn-peroxidase genes under field conditions. The Cortinarius glaucopus genome encodes 11 peroxidases – a number comparable to many white-rot wood decomposers. * These results support the hypothesis that some ectomycorrhizal fungi – Cortinarius species in particular – may play an important role in decomposition of complex organic matter, linked to their mobilization of organically bound N.

Place, publisher, year, edition, pages
2014. Vol. 203, no 1, p. 245-256
Keywords [en]
carbon sequestration, Class II peroxidases, decomposition, ectomycorrhizal fungi, high throughput sequencing, nitrogen limitation, priming effect, transcription
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Natural Sciences
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URN: urn:nbn:se:polar:diva-4142DOI: 10.1111/nph.12791OAI: oai:DiVA.org:polar-4142DiVA, id: diva2:1170863
Note

2013-16822

Available from: 2018-01-04 Created: 2018-01-04 Last updated: 2018-01-04

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Publisher's full texthttp://dx.doi.org/10.1111/nph.12791
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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
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  • de-DE
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  • en-US
  • fi-FI
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