Development of on-site tree vigor diagnosis method based on delayed fluorescence by applying very-weak light measurement technology

• Project/Area Number: 26450194
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Forest science
• Research Institution: Kyoto University
• Principal Investigator: IMANISHI Junichi 京都大学, 地球環境学堂, 助教 (80378851)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
• Keywords: 遅延蛍光 / 光合成 / 樹木 / 活力評価 / 造園 / 緑化 / 乾燥ストレス / クロロフィル蛍光 / 活力度評価 / 渇水ストレス

Outline of Final Research Achievements

Tree vigor diagnosis is essential for growing healthy trees and safety management. Delayed fluorescence is a phenomenon of light emission caused by backward reaction in photosynthesis. It is said that stress condition in plants can be assessed with high sensitivity by measuring delayed fluorescence. Therefore, this study aimed to develop an on-site assessment method of tree vigor based on delayed fluorescence. An on-site system for measuring very-weak light was built as a trial manufacture. Then, by measuring delayed fluorescence of flowering cherry trees planted in field, possibility of tree vigor assessment was studied. Consequently, it was indicated that growth condition (trend of good or bad growth) of the cherry trees is likely to be predicted with ca. 80 % correct answer rate.

Research Products

• [Journal Article] 遅延蛍光によるヤマザクラ個葉の急性乾燥ストレスの評価 (2016)
  • Author(s): 今西 純一，幾島 祐子，勝又 政和
  • Journal Title: ランドスケープ研究(オンライン論文集) Volume: 印刷中
  • NAID: 130005151535
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] On-site evaluation of growing status of flowering cherry trees using delayed fluorescence (2017)
  • Author(s): Imanishi, J., Ikushima, Y. and Katsumata, M.
  • Organizer: International Consortium of Landscape and Ecological Engineering (ICLEE) 8th Conference
  • Int'l Joint Research
• [Presentation] Detection of acute drought stress on four woody species using delayed fluorescence (2016)
  • Author(s): Imanishi, J., Ikushima, Y. and Katsumata, M.
  • Organizer: The 7th East Asian Federation of Ecological Societies International Congress
  • Place of Presentation: Daegu (Korea)
  • Year and Date: 2016-04-20
  • Int'l Joint Research
• [Presentation] ヤマザクラの急性乾燥ストレス評価における遅延蛍光の有効性 (2016)
  • Author(s): 今西 純一，小林 祐子，勝又 政和
  • Organizer: 第63回日本生態学会大会
  • Place of Presentation: 仙台国際センター（宮城県仙台市）
  • Year and Date: 2016-03-24
• [Presentation] Development of a new instrument that assesses tree vigor based on delayed fluorescence. (2014)
  • Author(s): Imanishi, J., Kobayashi, Y. and Katsumata, M.
  • Organizer: The 4th International Conference of Urban Biodiversity and Design (URBIO2014)
  • Place of Presentation: Incheon （Korea）
  • Year and Date: 2014-10-11
• [Patent(Industrial Property Rights)] METHOD FOR EVALUATING VITALITY OF PLANT, AND MEASUREMENT SYSTEM AND EVALUATION SYSTEM (2014)
  • Inventor(s): J. IMANISHI AND OTHERS
  • Industrial Property Rights Holder: J. IMANISHI AND OTHERS
  • Industrial Property Rights Type: 特許
  • Filing Date: 2014-05-14
  • Overseas