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Study on the photosymbiosis between cyanobacteria and planktonic protozoa

Research Project

Project/Area Number 16K00532
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Environmental dynamic analysis
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

FUJIKI Tetsuichi  国立研究開発法人海洋研究開発機構, 地球環境観測研究開発センター, 主任技術研究員 (30598248)

Co-Investigator(Kenkyū-buntansha) 木元 克典  国立研究開発法人海洋研究開発機構, 地球環境観測研究開発センター, 主任技術研究員 (40359162)
石谷 佳之  筑波大学, 計算科学研究センター, 研究員 (60772043)
Research Collaborator TAKAGI Haruka  
UEDA Masato  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords細胞内共生 / FRR法 / 原生動物 / 原核藻類 / 光合成 / 生物海洋
Outline of Final Research Achievements

Cyanobacteria-bearing planktic protozoans are newly discovered in the euphotic zone of the tropical and subtropical ocean. In the present study, we improved the fast-repetition-rate fluorometry to examine the photosynthetic activity of symbiotic cyanobacteria within host planktic protozoan. In addition, we succeeded in isolating the cyanobacteria from the planktic protozoan and revealed the photosynthetic characteristics of symbiotic cyanobacteria.

Academic Significance and Societal Importance of the Research Achievements

ラン藻には、光合成システム、窒素固定、嫌気代謝、従属栄養性などの生理的性質に様々なものいることが知られている。しかし、原生動物の体内から新たに発見されたラン藻の生理特性や宿主との関係については全く不明である。本研究で開発した手法を用いて、ラン藻と原生動物の関係を明らかにすることで、まだまだ謎の多い海洋での細胞内共生という現象の解明に新たな知見を与えることができる可能性がある。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (16 results)

All 2018 2017 2016

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (13 results) (of which Int'l Joint Research: 8 results,  Invited: 2 results) Book (1 results)

  • [Journal Article] Phylogeography of the pelagic snail Limacina helicina (Gastropoda: Thecosomata) in the subarctic western North Pacific2018

    • Author(s)
      Shimizu Keisuke、Kimoto Katsunori、Noshita Koji、Wakita Masahide、Fujiki Tetsuichi、Sasaki Takenori
    • Journal Title

      Journal of Molluscan Studies

      Volume: 84 Issue: 1 Pages: 30-37

    • DOI

      10.1093/mollus/eyx040

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of nutritional condition on photosymbiotic consortium of cultured Globigerinoides sacculifer (Rhizaria, Foraminifera)2018

    • Author(s)
      Takagi Haruka、Kimoto Katsunori、Fujiki Tetsuichi、Moriya Kazuyoshi
    • Journal Title

      Symbiosis

      Volume: 印刷中 Issue: 1 Pages: 25-39

    • DOI

      10.1007/s13199-017-0530-3

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] FRR法を用いた浮遊性原生動物と藻類の共生関係の解明2018

    • Author(s)
      藤木徹一、木元克典、高木悠花、石谷佳之
    • Organizer
      名古屋大学宇宙地球環境研究所研究集会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Disclosing photosymbiosis in modern planktic foraminifers2018

    • Author(s)
      Haruka Takagi, Tetsuichi Fujiki, Katsunori Kimoto, Kazuyoshi Moriya, Hiroaki Saito
    • Organizer
      FORAMS2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Experimental study of growth and photophysiology of Globigerinoides sacculifer to understand host-symbiont nutritional interactions2018

    • Author(s)
      Haruka Takagi, Tetsuichi Fujiki, Katsunori Kimoto, Kazuyoshi Moriya
    • Organizer
      FORAMS2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Phylogenomic approach to the early evolution of Foraminifera2018

    • Author(s)
      Yoshiyuki Ishitani, Yurika Ujiie, Euki Yazaki, Takashi Toyofuku, Yukiko, Nagai, Yuji Inagaki
    • Organizer
      FORAMS2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 化石に残るプランクトン浮遊性有孔虫~その生き様を探る~2018

    • Author(s)
      高木悠花
    • Organizer
      海洋生物シンポジウム2018
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Carbon fixation by endosymbiotic algae within protistan microzooplankton2017

    • Author(s)
      Haruka Takagi, Katsunori Kimoto, Tetsuichi Fujiki and Hiroaki Saito
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of a fast repetition rate fluorometer for autonomous ocean observation platforms2017

    • Author(s)
      Tetsuichi Fujiki, Naomi Harada, Hideshi Kimoto, Kensuke Watari and Yasuhisa Ishihara
    • Organizer
      AQUAFLUO II Chlorophyll Fluorescence in Aquatic Sciences
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Light dependent photophysiology and carbon fixation in symbiont bearing planktic foraminifers2017

    • Author(s)
      Haruka Takagi, Tetsuichi Fujiki and Katsunori Kimoto
    • Organizer
      AQUAFLUO II Chlorophyll Fluorescence in Aquatic Sciences
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Speciation and dispersal pattern of marine protists in the vertical dimension2017

    • Author(s)
      Yoshiyuki Ishitani, Yurika Ujiie, Yuji Inagaki and Kiyotaka Takishita
    • Organizer
      InterRad XV
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Molecular marker to identify radiolarian species -toward establishment of paleoenvironmental proxy-2017

    • Author(s)
      Yoshiyuki Ishitani
    • Organizer
      AGU Fall Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] いがいと流されない海の原生生物2017

    • Author(s)
      石谷佳之
    • Organizer
      原生生物学会&共生生物学会合同シンポジウム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] 単細胞ってすばらしい!!2016

    • Author(s)
      石谷佳之
    • Organizer
      東京大学大気海洋研究所オープンキャンパス
    • Place of Presentation
      東京大学大気海洋研究所 (千葉県柏市)
    • Year and Date
      2016-10-22
    • Related Report
      2016 Research-status Report
  • [Presentation] 浮遊性有孔虫各種の光共生性と光合成生理特性2016

    • Author(s)
      高木悠花、木元克典、藤木徹一、守屋和佳
    • Organizer
      日本海洋学会2016年度秋季大会
    • Place of Presentation
      鹿児島大学 (鹿児島県鹿児島市)
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Book] アメーバのはなし -原生生物・人・感染症-2018

    • Author(s)
      永宗喜三郎、島野智之、矢吹彬憲、丸山真一朗、八木田健司、福田康弘、中井裕、伊藤章、小林富美惠、野田悟子、平川泰久、白鳥峻志、廣岡裕吏、雪吹直史、松崎素道、石谷佳之、土屋正史、神川龍馬、中山卓郎、菅裕
    • Total Pages
      152
    • Publisher
      朝倉書店
    • ISBN
      9784254171686
    • Related Report
      2018 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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