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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, 245-256 p.Article 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, 245-256 p.
Keyword [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: 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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  • apa
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  • de-DE
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