Mechanisms of photosensory adaptation at the level of signaling factors in phototropism.

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K06211
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 44030:Plant molecular biology and physiology-related
• Research Institution: Niigata University
• Principal Investigator: Sakai Tatsuya 新潟大学, 自然科学系, 教授 (10360554)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 植物 / 光環境応答 / 光屈性 / フォトトロピン / タンパク質リン酸化 / NPH3

Outline of Final Research Achievements

This study tried to elucidate the function of phosphorylation modification of the phototropic signaling factor NPH3 in the phototropic responseｓ of Arabidopsis shoot hypocotyls by using molecular genetic techniques. The activation level of phot1 and the corresponding phosphorylation level of intrinsic disordered regions of NPH3 determine the reassociation rate of NPH3 on the plasma membrane. This mechanism may moderately maintain the active state of phot1 signaling across a broad range of BL intensities and contribute to the photosensory adaptation of phot1 signaling during the phototropic response in hypocotyls.

Free Research Field

植物分子遺伝学

Academic Significance and Societal Importance of the Research Achievements

本研究成果は植物の光源方向認識の分子基盤を提案する内容である。「目のない植物がどのように光源方向を認識しているのか」、さらに「植物の光屈性応答はどうして生物の光応答の中でもとりわけ光強度のダイナミックレンジが広いのか」という問いに答える内容であり、植物の光屈性応答にとどまらず、広範な生物の光環境適応機構の理解に貢献しうる知見となると考えられる。