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日本植物学会国際シンポジウム「Regulation of Cyclic electron flow, A to Z」




「Regulation of Cyclic electron flow, A to Z」


Hiroko Takahashi (Saitama Univ.), Ginga Shimakawa (CNRS)

Photosynthetic electron transport is an essential process for converting light energy to chemical energy. While liner electron flow from water to NADP+ generates both NADPH and ATP, the cyclic electron flow around photosystem I can generate only ATP, but it is important to achieve balance of the ATP/NADPH ratio for the Calvin-Benson cycle and to induce photoprotection under stress conditions. Although the phenomenon of cyclic electron flow was defined more than 50 years ago and many studies have contributed to revealing the molecular mechanisms, the details are still controversial. Here we organize the symposium focusing on the cyclic electron flow. The symposiasts will present the latest data related to the methodology for evaluating the cyclic electron flow, the diversity of the cyclic electron flow among the organisms, and the hypotheses to revisit the molecular mechanisms and regulations of the cyclic electron flow.

Opening remarks and General Introduction:

 Hiroko Takahashi(Graduate School of Science and engineering, Saitama University)

Ginga Shimakawa(Institute for Integrative Biology of the Cell, CEA, CNRS)

 Linear and cyclic electron flow in C4 plants

The diversity of cyclic electron flow: comparing rates and behaviors in green algae, dinoflagellates, diatoms and haptophytes

 Benjamin Bailleul(Institut de Biologie Physico-Chimique, CNRS)

Regulation mechanism of Photosystem I cyclic electron transport

 Yuki Okegawa(Faculty of Life Sciences, Kyoto Sangyo University)

PGR5 is required for efficient Q cycle in the cytochrome b6f complex during cyclic electron flow

 Felix Buchert(Institute of Plant Biology and Biotechnology, University of Münster)

Rice Plants Cope With Intrinsic Fluctuation of Photosynthesis Activity by Driving Alternative Electron Flow That Regulates P700 Oxidation

 Riu Furutani, Shinya Wada, Yuji Suzuki, Amane Makino, Chikahiro Miyake(Graduate School of

Agricultural Science, Kobe University, Faculty of Agriculture, Iwate University, Graduate School of

Agricultural Science, Tohoku University)

Linear and cyclic electron flow in C4 plants

 Ginga Shimakawa (Institute for Integrative Biology of the Cell, CEA, CNRS)

Discussion and Closing remarks

 Hiroko Takahashi (Graduate School of Science and engineering, Saitama University),

 Ginga Shimakawa (Institute for Integrative Biology of the Cell, CEA, CNRS)





2020年に提唱していたPSIでの活性酸素(ROS)生成とその抑制モデル(Antioxidants 2020, 9(3), 230; - 11 Mar 2020)の実証に成功しました。PSIでのO2還元によるH2O2生成の発見(メーラー反応, Mehler 1951)に始まる光合成生物でのROS代謝研究は、その後O2還元の

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