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Tricholoma matsutake may take more nitrogen in the organic form than other ectomycorrhizal fungi for its sporocarp development: the isotopic evidence.
- Source :
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Mycorrhiza [Mycorrhiza] 2019 Jan; Vol. 29 (1), pp. 51-59. Date of Electronic Publication: 2018 Nov 08. - Publication Year :
- 2019
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Abstract
- Tricholoma matsutake is an ectomycorrhizal (ECM) fungus capable of in vitro saprotrophic growth, but the sources of C and N used to generate sporocarps in vivo are not well understood. We examined natural abundance isotope data to investigate this phenomenon. For this purpose, C, N and their stable isotopes ( <superscript>13</superscript> C, <superscript>15</superscript> N) content of fungal sporocarps and their potential nutrient sources (i.e., foliage, litter, fine roots, wood, and soil) were investigated from two well-studied sites in Finland and Japan. Our results show that δ <superscript>13</superscript> C values of T. matsutake and other fungal groups are consistent with those of most studies, but a very high δ <superscript>15</superscript> N value (16.8‰ ± 2.3) is observed in T. matsutake. Such isotopic pattern of fungal δ <superscript>15</superscript> N suggests that matsutake has a greater proteolytic potential to digest chemically complex <superscript>15</superscript> N-enriched organic matter and hydrophobic hyphae. This assumption is further supported by a significant and positive correlation between δ <superscript>13</superscript> C <subscript>cap-stipe</subscript> and δ <superscript>15</superscript> N <subscript>cap-stipe</subscript> exclusively in T. matsutake, which suggests common C and N sources (protein) possible for isotopically enriched cap. The <superscript>13</superscript> C increase of caps relative to stipe presumably reflects greater contents of <superscript>13</superscript> C-enriched protein than <superscript>13</superscript> C-depleted chitin. We conclude that T. matsutake is a typical ECM fungus which obtains for its sporocarp development for both C and N from a common protein source (vs. photosynthetic carbon) present in soil organic matter.
Details
- Language :
- English
- ISSN :
- 1432-1890
- Volume :
- 29
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Mycorrhiza
- Publication Type :
- Academic Journal
- Accession number :
- 30406843
- Full Text :
- https://doi.org/10.1007/s00572-018-0870-8