惑星分光観測衛星プロジェクトチーム

Shunta Kimura

  (木村 駿太)

Profile Information

Affiliation
Specially Appointed Assistant Professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
The University of Tokyo
The Graduate University for Advanced Studies
Degree
Ph.D(Mar, 2018, University of Tsukuba)

Researcher number
60838762
J-GLOBAL ID
202001011430020518
researchmap Member ID
R000007282

Major Awards

 15

Major Papers

 17
  • Shunta Kimura, Shu Ishikawa, Nobuya Hayashi, Kazuhisa Fujita, Yuko Inatomi, Shino Suzuki
    Frontiers in Microbiology, 14 1253436, Dec 13, 2023  Peer-reviewedLead authorCorresponding author
  • Kaori Tomita-Yokotani, Shunta Kimura, Midori Ong, Miku Tokita, Hiroshi Katoh, Tomoko Abe, Hirofumi Hashimoto, Kintake Sonoike, Masayuki Ohmori
    Astrobiology, 21(12) 1505-1514, Dec, 2021  Peer-reviewed
  • Shunta Kimura, Masatoshi Nakajima, Emi Yumoto, Koji Miyamoto, Hisakazu Yamane, Midori Ong, Kaori Tomita-Yokotani, Tadao Asami
    Plant Growth Regulation, 92(2) 273-282, Jun 23, 2020  Peer-reviewedLead author
    © 2020, Springer Nature B.V. Cyanobacteria are distributed globally in the sea, fresh water, and land. Akinetes (dormant cells) of cyanobacteria are highly resistant to dry conditions, contributing to the survival of terrestrial cyanobacteria. However, the substances that regulate akinete dormancy and germination have not been elucidated. The present study investigated the effects of the phytohormone cytokinin (CK), on the germination stage of a terrestrial filamentous cyanobacterium, Nostoc sp. HK-01. In the cell suspensions of Nostoc sp. HK-01, isopentenyladenine (iP), isopentenyladenosine (iPR), cis-zeatin (cZ), cis-zeatinriboside (cZR), trans-zeatin (tZ), and a trace amount of trans-zeatinriboside (tZR) were identified, according to their retention times and multiple reaction monitoring (MRM) transitions, using high performance liquid chromatography and electrospray ionization tandem mass spectrometry (HPLC-ESI-MS/MS). Product ion scans also identified iP, iPR, cZ, and cZR. The present study established an isolation method for the dormant Nostoc akinetes, and then treated them with CKs. iP and tZ promoted the germination of akinetes, while cZ did not. S-4893, which is a CK antagonist, inhibited germination and the promotive activity of the applied iP. The results strongly suggest that cyanobacteria have a very similar perception system to plants, and that they regulate the dormancy and germination of their own cells and/or other cells via CKs. The production of CKs by several species of cyanobacteria was previously reported. However, this is the first investigation showing the role of phytohormones in the dormant cell physiology of cyanobacteria.
  • Shunta Kimura, Kaori Tomita-Yokotani, Hiroshi Katoh, Seigo Sato, Masayuki Ohmori
    Biological Sciences in Space, 31 1-8, 2017  Peer-reviewedLead author

Major Misc.

 14

Books and Other Publications

 1

Major Presentations

 57

Teaching Experience

 1
  • Oct, 2021
    分子細胞生物学  (東京農業大学大学院 生命科学研究科 バイオサイエンス専攻)

Major Research Projects

 11

Academic Activities

 1

Social Activities

 6

Media Coverage

 7