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Phytoplankton strategy for coping with high-light stress in the NW subarctic Pacific

Research Project

Project/Area Number 17K07887
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Aquatic bioproduction science
Research InstitutionNagoya University

Principal Investigator

MINO YOSHIHISA  名古屋大学, 宇宙地球環境研究所, 助教 (20362303)

Co-Investigator(Kenkyū-buntansha) 鋤柄 千穂  東京海洋大学, その他部局等, 特任助教 (90447128)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
KeywordsPSⅡ光損傷 / 植物プランクトン / 光防御メカニズム / 西部北太平洋亜寒帯域 / 基礎生産力 / 成層強化 / 亜寒帯植物プランクトンのPSII光損傷リスク / 亜寒帯植物プランクトンの代替的電子伝達 / PSII光失活 / 海洋
Outline of Final Research Achievements

Global warming leads to a shoaling of the oceanic surface mixed layer and possibly increases a photo-damage risk to photosystem (PS) II of phytoplankton. Here, we investigated the susceptibility to PSII photoinactivation of natural assemblages in the NW subarctic Pacific. Our results suggest that a plastoquinol terminal oxidase (PTOX) mediated electron flow alleviates excessive PSII excitation pressure, corresponding to a 10-35 % reduction in potential inactivation.

Academic Significance and Societal Importance of the Research Achievements

大気CO2吸収域である北太平洋亜寒帯域の生物生産は夏季に最大値をとる。この成層期の生産力に対して温暖化による海洋表層の成層強化がどのように影響するかは、北太平洋の生物ポンプ効率および海洋炭素循環の将来像を予測する上で重要な課題である。本研究では、混合層内の平均光量の増加が植物プランクトンのPSⅡの光損傷リスクを増大させる可能性を検討するため、天然群集のPSⅡ光失活特性を調査した。この結果、亜寒帯プランクトン群集はPTOX経路を介してPSⅡ光損傷リスクを軽減していることが判った。この光防御機能を保持する限り、成層が強化されても光損傷リスクはそれほど増大しないことが予想される。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (9 results)

All 2020 2019 2018 2017

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Seasonal and Interannual Variations in Nitrogen Availability and Particle Export in the Northwestern North Pacific Subtropical Gyre2020

    • Author(s)
      Mino Y.、Sukigara C.、Honda M. C.、Kawakami H.、Wakita M.、Sasaoka K.、Yoshikawa C.、Abe O.、Kaiser J.、Kimoto K.、Kitamura M.、Fujiki T.、Matsumoto K.、Saino T.
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 125 Issue: 5 Pages: 15600-15600

    • DOI

      10.1029/2019jc015600

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system2019

    • Author(s)
      Fujiki Tetsuichi、Inoue Ryuichiro、Honda Makio C.、Wakita Masahide、Mino Yoshihisa、Sukigara Chiho、Abe Osamu
    • Journal Title

      Limnology and Oceanography

      Volume: 65 Issue: 5 Pages: 1072-1084

    • DOI

      10.1002/lno.11372

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Time-series observations of primary production in the western subtropical Pacific by an underwater profiling buoy system: relationship between GOP and dissolved oxygen.2020

    • Author(s)
      Fujiki, T., R. Inoue, M. C. Honda, M. Wakita, C. Sukigara, Y. Mino, O. Abe
    • Organizer
      Ocean Science Meeting 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Relationship between phytoplankton productivity and oxygen cycle in the subtropical western North Pacific2019

    • Author(s)
      Fujiki, T., R. Inoue, M. C. Honda, M. Wakita, C. Sukigara, Y. Mino, O. Abe
    • Organizer
      ASLO 2019 Aquatic Science Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 西部北太平洋亜寒帯域の植物プランクトン群集の季節変動:物理・化学プロセスとの関係2018

    • Author(s)
      藤木徹一, 喜多村稔, 細田滋毅, 原田尚美, 脇田昌英, 三野義尚
    • Organizer
      2018年度日本海洋学会秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Influence of physical and chemical processes on phytoplankton community in the western subarctic Pacific2018

    • Author(s)
      Fujiki, T., M. Kitamura, S. Hosoda, N. Harada, M. Wakita, Y. Mino
    • Organizer
      第二回OMIX国際シンポジウム「海洋混合過程:生物地球化学、気候、生態系への影響」
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 西部北太平洋における植物プランクトン群集の強光応答2018

    • Author(s)
      三野義尚, 藤木徹一, 本多牧生, 原田尚美, 鋤柄千穂
    • Organizer
      名古屋大学ISEE共同利用集会「水圏クロロフィル蛍光に関する知識統合と研究戦略」
    • Related Report
      2018 Research-status Report
  • [Presentation] 北西部亜寒帯太平洋における天然植物プランクトン群集の強光応答戦略2018

    • Author(s)
      三野義尚、藤木徹一、鋤柄千穂、本多牧生、松本和彦、原田尚美
    • Organizer
      H29年度OMIX(海洋混合学の創設)全体会議
    • Related Report
      2017 Research-status Report
  • [Presentation] Phytoplankton strategy for coping with high-light stress in the NW subarctic Pacific2017

    • Author(s)
      Y. Mino, T. Fujiki, C. Sukigara, M. C. Honda, K. Matsumoto, N. Harada
    • Organizer
      Climate Change Cluster Colloquium 2017: AQUAFLUO II Chlorophyll Fluorescence in Aquatic Sciences
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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