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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.

Identifieur interne : 000291 ( Main/Exploration ); précédent : 000290; suivant : 000292

Tricholoma matsutake may take more nitrogen in the organic form than other ectomycorrhizal fungi for its sporocarp development: the isotopic evidence.

Auteurs : Lu-Min Vaario [Finlande, Japon] ; Shambhu Prasad Sah [Finlande] ; Mariko Norisada [Japon] ; Maki Narimatsu [Japon] ; Norihisa Matsushita [Japon]

Source :

RBID : pubmed:30406843

Descripteurs français

English descriptors

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 (13C, 15N) 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 δ13C values of T. matsutake and other fungal groups are consistent with those of most studies, but a very high δ15N value (16.8‰ ± 2.3) is observed in T. matsutake. Such isotopic pattern of fungal δ15N suggests that matsutake has a greater proteolytic potential to digest chemically complex 15N-enriched organic matter and hydrophobic hyphae. This assumption is further supported by a significant and positive correlation between δ13Ccap-stipe and δ15Ncap-stipe exclusively in T. matsutake, which suggests common C and N sources (protein) possible for isotopically enriched cap. The 13C increase of caps relative to stipe presumably reflects greater contents of 13C-enriched protein than 13C-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.

DOI: 10.1007/s00572-018-0870-8
PubMed: 30406843
PubMed Central: PMC6311186


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">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 (
<sup>13</sup>
C,
<sup>15</sup>
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
<sup>13</sup>
C values of T. matsutake and other fungal groups are consistent with those of most studies, but a very high δ
<sup>15</sup>
N value (16.8‰ ± 2.3) is observed in T. matsutake. Such isotopic pattern of fungal δ
<sup>15</sup>
N suggests that matsutake has a greater proteolytic potential to digest chemically complex
<sup>15</sup>
N-enriched organic matter and hydrophobic hyphae. This assumption is further supported by a significant and positive correlation between δ
<sup>13</sup>
C
<sub>cap-stipe</sub>
and δ
<sup>15</sup>
N
<sub>cap-stipe</sub>
exclusively in T. matsutake, which suggests common C and N sources (protein) possible for isotopically enriched cap. The
<sup>13</sup>
C increase of caps relative to stipe presumably reflects greater contents of
<sup>13</sup>
C-enriched protein than
<sup>13</sup>
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.</div>
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<sup>13</sup>
C,
<sup>15</sup>
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
<sup>13</sup>
C values of T. matsutake and other fungal groups are consistent with those of most studies, but a very high δ
<sup>15</sup>
N value (16.8‰ ± 2.3) is observed in T. matsutake. Such isotopic pattern of fungal δ
<sup>15</sup>
N suggests that matsutake has a greater proteolytic potential to digest chemically complex
<sup>15</sup>
N-enriched organic matter and hydrophobic hyphae. This assumption is further supported by a significant and positive correlation between δ
<sup>13</sup>
C
<sub>cap-stipe</sub>
and δ
<sup>15</sup>
N
<sub>cap-stipe</sub>
exclusively in T. matsutake, which suggests common C and N sources (protein) possible for isotopically enriched cap. The
<sup>13</sup>
C increase of caps relative to stipe presumably reflects greater contents of
<sup>13</sup>
C-enriched protein than
<sup>13</sup>
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.</AbstractText>
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<Year>2018</Year>
<Month>03</Month>
<Day>27</Day>
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<PubMedPubDate PubStatus="accepted">
<Year>2018</Year>
<Month>10</Month>
<Day>16</Day>
</PubMedPubDate>
<PubMedPubDate PubStatus="pubmed">
<Year>2018</Year>
<Month>11</Month>
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<PubMedPubDate PubStatus="medline">
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<ArticleId IdType="pubmed">30406843</ArticleId>
<ArticleId IdType="doi">10.1007/s00572-018-0870-8</ArticleId>
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<ArticleId IdType="pmc">PMC6311186</ArticleId>
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<list>
<country>
<li>Finlande</li>
<li>Japon</li>
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<region>
<li>Région de Kantō</li>
<li>Uusimaa</li>
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<settlement>
<li>Helsinki</li>
<li>Tokyo</li>
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<orgName>
<li>Université d'Helsinki</li>
<li>Université de Tokyo</li>
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<country name="Finlande">
<region name="Uusimaa">
<name sortKey="Vaario, Lu Min" sort="Vaario, Lu Min" uniqKey="Vaario L" first="Lu-Min" last="Vaario">Lu-Min Vaario</name>
</region>
<name sortKey="Sah, Shambhu Prasad" sort="Sah, Shambhu Prasad" uniqKey="Sah S" first="Shambhu Prasad" last="Sah">Shambhu Prasad Sah</name>
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<country name="Japon">
<region name="Région de Kantō">
<name sortKey="Vaario, Lu Min" sort="Vaario, Lu Min" uniqKey="Vaario L" first="Lu-Min" last="Vaario">Lu-Min Vaario</name>
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<name sortKey="Matsushita, Norihisa" sort="Matsushita, Norihisa" uniqKey="Matsushita N" first="Norihisa" last="Matsushita">Norihisa Matsushita</name>
<name sortKey="Narimatsu, Maki" sort="Narimatsu, Maki" uniqKey="Narimatsu M" first="Maki" last="Narimatsu">Maki Narimatsu</name>
<name sortKey="Norisada, Mariko" sort="Norisada, Mariko" uniqKey="Norisada M" first="Mariko" last="Norisada">Mariko Norisada</name>
</country>
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