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Ectomycorrhizal Cor...
Ectomycorrhizal Cortinarius species participate in enzymatic oxidation of humus in northern forest ecosystems
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- Bödeker, Inga (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skoglig mykologi och patologi,Institutionen för sydsvensk skogsvetenskap,Department of Forest Mycology and Pathology,Southern Swedish Forest Research Centre
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- Engelbrecht Clemmensen, Karina (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skoglig mykologi och patologi,Department of Forest Mycology and Pathology
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- Olson, Åke (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Department of Forest Mycology and Plant Pathology
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- Lindahl, Björn (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skoglig mykologi och patologi,Department of Forest Mycology and Pathology
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(creator_code:org_t)
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- 2014-04-14
- 2014
- English.
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In: New Phytologist. - : Wiley. - 0028-646X .- 1469-8137. ; 203, s. 245-256
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Biologi -- Mikrobiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Microbiology (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Skogsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Forest Science (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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