Kyushu University Academic Staff Educational and Research Activities Database
Researcher information (To researchers) Need Help? How to update
Juntaro Negi Last modified date:2019.06.17

Associate Professor / Informational biology
Department of Biology
Faculty of Sciences


Graduate School
Undergraduate School


E-Mail
Academic Degree
Ph.D
Country of degree conferring institution (Overseas)
No
Field of Specialization
plant physiology
Total Priod of education and research career in the foreign country
00years00months
Research
Research Interests
  • New insight into the function of the guard cell chloroplast by a genetic approach
    keyword : guard cell chloroplast
    2013.03~2018.10.
  • The development of functional stomata in Arabidopsis
    keyword : Dof transcription factor, SCAP1
    2008.05~2013.02.
  • Molecular mechanism of guard cell CO2 sensing
    keyword : CO2 stomata mutant SLAC1
    2002.04.
Academic Activities
Reports
1. Juntaro Negi, Mimi Hashimoto-Sugimoto, kensuke kusumi, Koh Iba, New Approaches to the Biology of Stomatal Guard Cells, Plant Cell Physiol., 2014.02, [URL], CO2 acts as an environmental signal that regulates stomatal movements. High CO2 concentrations reduce stomatal aperture, whereas low concentrations trigger stomatal opening. In contrast to our advanced understanding of light and drought stress responses in guard cells, the molecular mechanisms underlying stomatal CO2 sensing and signaling are largely unknown. Leaf temperature provides a convenient indicator of transpiration, and can be used to detect mutants with altered stomatal control. To identify genes that function in CO2 responses in guard cells, CO2-insensitive mutants were isolated through high-throughput leaf thermal imaging. The isolated mutants are categorized into three groups according to their phenotypes: (i) impaired in stomatal opening under low CO2 concentrations; (ii) impaired in stomatal closing under high CO2 concentrations; and (iii) impaired in stomatal development. Characterization of these mutants has begun to yield insights into the mechanisms of stomatal CO2 responses. In this review, we summarize the current status of the field and discuss future prospects. .
Papers
1. Juntaro Negi, Shintaro Munemasa, Boseok Song, Ryosuke Tadakuma, Mayumi Fujita, Tamar Azoulay-Shemer, Cawas B. Engineer, Kensuke Kusumi, Ikuo Nishida, Julian I. Schroeder, Koh Iba, Eukaryotic lipid metabolic pathway is essential for functional chloroplasts and CO2 and light responses in Arabidopsis guard cells, Proceedings of the National Academy of Sciences of the United States of America, 10.1073/pnas.1810458115, 115, 36, 9038-9043, 2018.09.
2. Yoshiko Yamamoto, Juntaro Negi, Cun Wang, Yasuhiro Isogai, Julian Schroeder, Koh Iba, The Transmembrane Region of Guard Cell SLAC1 Channels Perceives CO2 Signals via an ABA-Independent Pathway in Arabidopsis, PLANT CELL, 10.1105/tpc.15.00583, 28, 2, 557-567, 2016.02, [URL].
3. Juntaro Negi, Kosuke Moriwaki, Mineko Konishi, Ryusuke Yokoyama, Toshiaki Nakano, kensuke kusumi, Mimi Hashimoto-Sugimoto, Julian I. Schroeder, Kazuhiko Nishitani, Shuichi Yanagisawa, Koh Iba, A Dof Transcription Factor, SCAP1, Is Essential for the Development of Functional Stomata in Arabidopsis., Current Biology, 23, 6, 479-484, 2013.03.
4. Juntaro Negi, Osamu Matsuda, Takashi Nagasawa, Yasuhiro Oba, Hideyuki Takahashi, Maki Kawai-Yamada, Hirofumi Uchimiya, Mimi Hashimoto, Koh Iba, CO2 regulator SLAC1 and its homologues are essential for anion homeostasis in plant cells, Nature, 452, 27, 483-486, 2008.03.
Presentations
1. Juntaro Negi, Boseok Song, Sho Yamagaki, Koh Iba, Guard cell chloroplasts develop a unique lipid metabolism essential for CO2 and light responses, Keystone Symposium (Climate Change-linked Stress Tolerance), 2019.05.
2. Juntaro Negi, Shintaro Munemasa, Boseok Song, Ryosuke Tadakuma, Mayumi Fujita, Tamar Azoulay-Shemer, Cawas B. Engineer, Kensuke Kusumi, Ikuo Nishida, Julian I. Schroeder, Koh Iba, Eukaryotic lipid metabolic pathway is essential for functional chloroplasts and CO2 and light responses in stomatal guard cells, The International Conference on Arabidopsis Research (ICAR) 2018, 2018.06.
3. Juntaro Negi, Kosuke Moriwaki, Mineko Konishi, Ryusuke Yokoyama, Toshiaki Nakano, kensuke kusumi, Mimi Hashimoto-Sugimoto, Julian I. Schroeder, Kazuhiko Nishitani, Shuichi Yanagisawa, Koh Iba, SCAP1, a master regulator of the development of functional stomata in Arabidopsis, International Workshop on Plant Membrane Biology (IWPMB2013), 2013.03.
Membership in Academic Society
  • The Botanical Society of Japan
  • The Japanese Society of Plant Physiologsts
  • Japanese Society for Plant Cell and Molecular Biology
Awards
  • New insight into the mechanisms of stomatal regulation and morphogenesis