The soil organic matter decomposition mechanisms in ectomycorrhizal fungi are tuned for liberating soil organic nitrogen
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- César Nicolás
- Department of Biology, Microbial Ecology Group, Lund University , Ecology Building, SE-223 62 Lund, Sweden
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- Tomas Martin-Bertelsen
- Department of Astronomy and Theoretical Physics, Computational Biology and Biological Physics, Lund University , Sölvegatan 14A, SE-223 62 Lund, Sweden
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- Dimitrios Floudas
- Department of Biology, Microbial Ecology Group, Lund University , Ecology Building, SE-223 62 Lund, Sweden
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- Johan Bentzer
- Department of Biology, Microbial Ecology Group, Lund University , Ecology Building, SE-223 62 Lund, Sweden
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- Mark Smits
- Centre for Environmental Sciences, Hasselt University , Building D, Agoralaan, 3590 Diepenbeck, Limburg, Belgium
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- Tomas Johansson
- Department of Biology, Microbial Ecology Group, Lund University , Ecology Building, SE-223 62 Lund, Sweden
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- Carl Troein
- Department of Astronomy and Theoretical Physics, Computational Biology and Biological Physics, Lund University , Sölvegatan 14A, SE-223 62 Lund, Sweden
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- Per Persson
- Department of Biology, Microbial Ecology Group, Lund University , Ecology Building, SE-223 62 Lund, Sweden
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- Anders Tunlid
- Department of Biology, Microbial Ecology Group, Lund University , Ecology Building, SE-223 62 Lund, Sweden
説明
<jats:title>Abstract</jats:title> <jats:p>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.</jats:p>
収録刊行物
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- The ISME Journal
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The ISME Journal 13 (4), 977-988, 2018-12-11
Oxford University Press (OUP)
