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Ecological and toxicological genomics of toxic waterbloom-forming cyaobacterium occurring in brackish water

Research Project

Project/Area Number 15K07523
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Aquatic bioproduction science
Research InstitutionUniversity of Tsukuba

Principal Investigator

Tanabe Yuuhiko  筑波大学, 藻類バイオマス・エネルギーシステム開発研究センター, 主任研究員 (80391126)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsアオコ / 汽水湖 / 塩分耐性 / 浸透圧調整物質 / ゲノミクス / ミクロシスティス / スクロース / 汽水 / 遺伝子水平伝播 / 汽水域 / 浸透圧調節物質
Outline of Final Research Achievements

A toxic cyanobacterium Microcystis aeruginosa is often found associated with blooms in eutrophic water bodies worldwide. M. aeruginosa is salt-sensitive; so blooms of M. aeruginosa commonly occur in fresh water. Although rare, they also found in brackish water such as Lakes Shinji and Abashiri in Japan. However, the biological basis of M. aeruginosa bloom occurrence in brackish water has been poorly investigated. In this study, we performed genomic, genetic, physiological,and biochemical characterization of M. aeruginosa isolated from brackish water.We have revealed the genomic basis and evolutionary process of M. aeruginosa bloom occurrence in brackish water.We suggest that M.aeruginosa has evolved salt-resistance via horizontal transmission of genes for salt-resistance in response to recent anthropogenic eutrophication of brackish water.

Academic Significance and Societal Importance of the Research Achievements

日本において汽水湖は、シジミ漁に代表される水産業がさかんな自然環境である。それゆえに、汽水湖における有毒アオコの発生には悪臭・生態系破壊・水産物の毒素汚染等の様々な公衆衛生リスクが潜在する。本研究課題において、汽水湖の富栄養化が塩分耐性を持つアオコの急速な進化を誘発することを明らかにした。また、1%以上の塩分ではアオコは増殖できないことも明らかにした。以上の結果は、汽水湖への栄養塩負荷を下げること、塩分のコントロール等によってアオコの発生を抑制可能なことを意味するため、汽水域の環境保全施策に示唆を与えるものである。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017 2016 Other

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 3 results) Presentation (5 results) (of which Invited: 1 results) Remarks (2 results)

  • [Journal Article] Draft genome sequence of Microcystis aeruginosa NIES-4285, isolated from brackish water (Lake Abashiri, Japan)2019

    • Author(s)
      Yuuhiko Tanabe, Haruyo Yamaguchi
    • Journal Title

      Microbiology Resource Announcements

      Volume: 8 Issue: 6

    • DOI

      10.1128/mra.00001-19

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Adaptation of the freshwater bloom-forming cyanobacterium Microcystis aeruginosa to brackish water is driven by recent horizontal transfer of sucrose genes2018

    • Author(s)
      Yuuhiko Tanabe, Yoshikuni Hodoki, Tomoharu Sano, Kiyoshi Tada, Makoto M Watanabe
    • Journal Title

      Frontiers in Microbiology

      Volume: 9 Pages: 1150-1150

    • DOI

      10.3389/fmicb.2018.01150

    • NAID

      120006482850

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evolutionary history of phycoerythrin pigmentation in the water bloom-forming cyanobacterium Microcystis aeruginosa2018

    • Author(s)
      Yuuhiko Tanabe, Haruyo Yamaguchi
    • Journal Title

      bioRxiv

      Volume: - Pages: 485508-485508

    • DOI

      10.1101/485508

    • Related Report
      2018 Annual Research Report
    • Open Access
  • [Presentation] 赤いあおこちゃん~フィコエリスリンを持つミクロシスティスのゲノム解析2019

    • Author(s)
      田辺雄彦、山口晴代
    • Organizer
      日本藻類学会第43回大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 網走アオコ番外地~ミクロシスティスの汽水適応の最前線2018

    • Author(s)
      田辺雄彦
    • Organizer
      日本藻類学会第42回大会
    • Related Report
      2017 Research-status Report
  • [Presentation] アオコ形成ラン藻Microcystis aeruginosaの汽水適応株の生理と多様性2017

    • Author(s)
      田辺雄彦,程木義邦,多田清志,佐野友春,渡邉信
    • Organizer
      日本藻類学会第41回大会
    • Place of Presentation
      高知大学(高知県高知市)
    • Year and Date
      2017-03-25
    • Related Report
      2016 Research-status Report
  • [Presentation] アオコ形成ラン藻Microcystisの多様性2017

    • Author(s)
      田辺雄彦
    • Organizer
      研究集会「シアノバクテリアの生態学的多様性と系統分類」
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] アオコ形成ラン藻Microcystis aeruginosaの汽水適応のゲノム基盤2016

    • Author(s)
      田辺雄彦,程木義邦
    • Organizer
      日本藻類学会第40回大会
    • Place of Presentation
      日本歯科大学(東京都千代田区)
    • Year and Date
      2016-03-20
    • Related Report
      2015 Research-status Report
  • [Remarks]

    • URL

      https://www.tsukuba.ac.jp/attention-research/p201606051300.html

    • Related Report
      2018 Annual Research Report
  • [Remarks]

    • URL

      https://academist-cf.com/journal/?p=7952

    • Related Report
      2018 Annual Research Report

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Published: 2015-04-16   Modified: 2020-03-30  

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