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Carbon allocation to mycorrhizal fungi symbiotic to very fine roots

Research Project

Project/Area Number 19K06128
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 40010:Forest science-related
Research InstitutionTokyo University of Agriculture

Principal Investigator

IMAI Nobuo  東京農業大学, 地域環境科学部, 准教授 (00722638)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords菌根菌 / 森林 / 炭素動態 / 呼吸 / 土壌微生物 / 炭素配分 / 二酸化炭素 / 根 / 外生菌根 / アーバスキュラー菌根 / 土壌呼吸 / 炭素フラックス / 温暖化
Outline of Research at the Start

樹木は光合成で得た炭素のうちの相当量を、根とそれに共生する菌根菌に呼吸基質として配分している。菌根菌呼吸はこれまで、測定の技術的困難さにより根呼吸と一括りにされほとんど無視されてきた。しかし、菌根菌と根ではサイズや生理機構が全く異なるため、呼吸の環境応答特性は両者で異なると考えられる。また菌根菌呼吸は、宿主樹木の生活型(常緑・落葉、アーバスキュラー・外生菌根性)によっても変化すると考えられる。本研究では、先端根圏における菌根菌呼吸の野外リアルタイム測定手法の開発し、菌根菌呼吸に及ぼす宿主樹木の生活型(常緑・落葉)と菌根菌タイプ(外生菌根性・アーバスキュラー性)の影響を明らかにする。

Outline of Final Research Achievements

Carbon allocation to mycorrhizal fungi has been lumped together with root respiration, and therefore it has been largely ignored. Previous studies on mycorrhizal respiration were conducted using the chamber method on the forest floor. Mycorrhizal respiration rate using the chamber method can obtain a low, and a mixed value from multiple trees. Given that mycorrhizal respiration may vary with host tree species, mycorrhizal fungal species, root size, and prior photosynthesis rate, development of a measuring method at a fine root scale is needed. Here, we developed a method to measure the respiration rate of mycorrhizas symbiotic to very fine root, using a syringe-type microchamber in combination with a fungicide. We found that mycorrhizal respiration rates varied depending on the life type (i.e., evergreen or deciduous) of the host tree.

Academic Significance and Societal Importance of the Research Achievements

樹木は光合成で得た炭素のうちの相当量を、根とそれに共生する菌根菌に呼吸基質として配分している。こうした根圏呼吸の理解は、温暖化応答予測や物質循環の解明に欠かせない。本研究は、これまで植物根の呼吸と一括りにされほとんど無視されてきた菌根菌呼吸速度の測定手法を開発した。また本手法は、従来の林分レベルでの測定では不可能だった、各樹種の高活性根圏における菌根菌呼吸を測定するもので、菌根菌への炭素配分パターンの詳細な理解に寄与できる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (14 results)

All 2022 2021 2020 2019 Other

All Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (6 results) (of which Invited: 1 results) Book (2 results) Remarks (1 results)

  • [Journal Article] Interspecific differences in the responses of root phosphatase activities and morphology to nitrogen and phosphorus fertilization in Bornean tropical rain forests2022

    • Author(s)
      Hirano Yu、Kitayama Kanehiro、Imai Nobuo
    • Journal Title

      Ecology and Evolution

      Volume: 12 Issue: 3

    • DOI

      10.1002/ece3.8669

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Litterfall silicon flux in relation to vegetation differences in old‐growth and logged lowland forests in Borneo2021

    • Author(s)
      Nakamura Ryosuke、Imai Nobuo、Aoyagi Ryota、Kitayama Kanehiro、Kitajima Kaoru
    • Journal Title

      Ecological Research

      Volume: 36 Issue: 5 Pages: 892-900

    • DOI

      10.1111/1440-1703.12253

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The global abundance of tree palms2020

    • Author(s)
      Muscarella R, Emilio T, Phillips OL et al. (Imai N 94/223 persons)
    • Journal Title

      Global Ecology and Biogeography

      Volume: 29 Issue: 9 Pages: 14951514-14951514

    • DOI

      10.1111/geb.13123

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Climatic controls of decomposition drive the global biogeography of forest-tree symbioses2019

    • Author(s)
      Steidinger BS, Crowther TW, Liang J et al. (Imai N 99/222 persons)
    • Journal Title

      Nature

      Volume: 569 Issue: 7756 Pages: 404-408

    • DOI

      10.1038/s41586-019-1128-0

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Impacts of selective logging on spatial structure of tree species composition in Bornean tropical rain forests2019

    • Author(s)
      Imai N, Sugau JB, Pereira JT, Titin J, Kitayama K
    • Journal Title

      Journal of Forest Research

      Volume: 24 Issue: 6 Pages: 335-340

    • DOI

      10.1080/13416979.2019.1666958

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 暖温帯二次林における菌根菌糸生産の季節変化 :異なる菌根菌タイプの樹種間比較2022

    • Author(s)
      寺井水萌, 小南裕志, 今井伸夫
    • Organizer
      日本生態学会第69回全国大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 暖温帯二次林における根滲出物速度の季節変化2022

    • Author(s)
      平野侑, 三苫果鈴, 佐々木優子, 牧田直樹, 今井伸夫
    • Organizer
      日本生態学会第69回全国大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 暖温帯林における菌根菌の菌糸成長に及ぼす宿主樹種の影響2021

    • Author(s)
      青木一真, 小南裕志, 今井伸夫
    • Organizer
      日本生態学会第68回全国大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 暖温帯林における菌根菌の菌糸成長に及ぼす宿主樹種の影響2020

    • Author(s)
      青木一真, 小南裕志, 今井伸夫
    • Organizer
      日本生態学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 菌根菌糸の呼吸速度測定手法の開発2019

    • Author(s)
      今井伸夫
    • Organizer
      菌根研究会大会JCOM2019
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Effects of nitrogen and phosphorus fertilization on the morphology and phosphatase activity of fine roots in Bornean tropical rain forests2019

    • Author(s)
      Hirano Y, Kitayama K, Imai N
    • Organizer
      British Ecological Society annual meeting 2019
    • Related Report
      2019 Research-status Report
  • [Book] マングローブ林の生態系生態学2021

    • Author(s)
      ダニエル M アロンギ著、今井伸夫, 古川恵太, 中嶋亮太, 檜谷昂訳
    • Total Pages
      283
    • Publisher
      東京農業大学出版会
    • Related Report
      2021 Annual Research Report
  • [Book] マングローブ林の生態系生態学 (翻訳書)2021

    • Author(s)
      今井伸夫, 古川恵太, 中嶋亮太, 檜谷昂
    • Total Pages
      283
    • Publisher
      東京農業大学出版会
    • ISBN
      9784886945051
    • Related Report
      2020 Research-status Report
  • [Remarks] 今井伸夫の個人HP

    • URL

      http://nobuoimai.web.fc2.com/index.html

    • Related Report
      2021 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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