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Reconstruction of the evolution and diversification in ascidian-cyanobacterial symbiosis

Research Project

Project/Area Number 16K07483
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Biodiversity/Systematics
Research InstitutionUniversity of the Ryukyus

Principal Investigator

HIROSE Euichi  琉球大学, 理学部, 教授 (30241772)

Co-Investigator(Kenkyū-buntansha) 広瀬 慎美子  東海大学, 海洋学部, 特任准教授 (10398307)
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: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsホヤ / 分子系統 / 光共生 / 藍藻 / 進化 / 多様性 / 共生 / 系統
Outline of Final Research Achievements

Cyanobacterial symbiosis in some colonial ascidians of the four genera in the family Didemnidae is the only obligate-symbiosis system between the chordates and photosynthetic organisms. We examined the molecular phylogeny of didemnid ascidians including non-symbiotic and symbiotic species belonging to six didemnid genera. The phylogenetic tree supports the monophyly of Diplosoma, while photosymbiotic species of Trididemnum were separated into four discrete clades. We mapped the modes of symbiosis (e.g., cyanobacterial species, distribution pattern on the phylogenetic tree to elucidate the evolutionary history of this symbiosis system. The present results supported that 1) cyanobacterial symbiosis was independently established in multiple times within Didemnidae, 2) similar modes of symbiosis were convergently evolved in discrete genera and/or clades.

Academic Significance and Societal Importance of the Research Achievements

サンゴやシャコガイなど光合成生物と共生することによって効率の良い代謝系システムを獲得している動物が様々な分類群で知られているが、共生システムの進化・多様化についてはわかっていないことが多い。本研究では我々を含む脊索動物では唯一の光合成共生系であるホヤと藍藻について、宿主ホヤの系統と共生様式の多様性から、共生系の進化・多様化過程を推定することができた。これにより、なぜ脊索動物においてはジデムニ科ホヤにおいて『だけ』繰り返し藍藻との共生成立が生じたのかという問題が新たに提起される。

Report

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

    (4 results)

All 2018 2017 Other

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

  • [Int'l Joint Research] 中央研究院(台湾)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Cytoplasmic UV-R absorption in an integumentary matrix (tunic) of photosymbiotic ascidian colonies2018

    • Author(s)
      Sensui N, Hirose E
    • Journal Title

      Zoological Studies

      Volume: 57 (3) Pages: 1-11

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] COI領域の分子系統からみた藍藻共生ホヤにおける共生様式の多様化2018

    • Author(s)
      広瀬慎美子,広瀬裕一
    • Organizer
      日本動物学会第89回大会代替集会
    • Related Report
      2018 Annual Research Report
  • [Presentation] COIバーコード領域の分子系統に基づくホヤと藍藻の共生プロセスの再構築2017

    • Author(s)
      広瀬慎美子・広瀬裕一
    • Organizer
      日本動物学会第88回大会
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2022-02-22  

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