2023 Fiscal Year Final Research Report
New interpretation of trees' strategies on the water conduction
Project/Area Number |
21K19147
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Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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Allocation Type | Multi-year Fund |
Review Section |
Medium-sized Section 40:Forestry and forest products science, applied aquatic science, and related fields
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Research Institution | Kobe University |
Principal Investigator |
Keiko Kuroda 神戸大学, 農学研究科, 非常勤講師 (20353675)
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Co-Investigator(Kenkyū-buntansha) |
東 若菜 神戸大学, 農学研究科, 助教 (20780761)
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Project Period (FY) |
2021-07-09 – 2024-03-31
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Keywords | 通水阻害 / エンボリズム / アコースティックエミッション / AE / 通水回復 / オリーブ / シマトネリコ / アセビ |
Outline of Final Research Achievements |
The objectives of the study were to elucidate the phenomena that occur within the tree trunk during the process of water supply cessation and recovery with physiological and anatomical methods. (1) Variations in the AE (embolism occurrence) revealed that the cessation of water conduction was related to wind speed, temperature, increased VPD and decreased humidity; the loss of daily periodicity in the AE counts after September was inferred to be due to a decrease in physiological responses, which prevented the suppression of xylem dysfunction. (2) When cut branches of Pieris japonica were left in the air and then inhaled a dye solution, the longer the drying time, the higher the position reached by the dye. The pigment was observed in the earlywood vessels and in the pits of the wood fibers, but not in the radial parenchyma tissue. Water movement through the wood fibers was suggested in the recovery of water conduction in P. japonica.
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Free Research Field |
樹木組織学、樹木生理学
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Academic Significance and Societal Importance of the Research Achievements |
長寿の樹木では幹内の水分流動が長期的に安定する必要があり、通水停止からの回復の仕組みが重要である。これは単純な毛細管内の物理現象ではなく、セルロースなどの複合材料からなる細胞壁の物性や生細胞の機能を含めて検討する必要があり、1980年代からの通説Cohesion-tension theory(水分子の凝集力と蒸散によって通水が持続する)は原理の解説が不完全であった。本研究では「通水の停止から回復の仕組み」「細胞壁の濡れ性と通水の持続性」を解明し、新たな説を確立した点で学術的意義が高い。さらに通水という高度な生物機能をバイオミメティクスとして技術的に発展させる方向が期待でき、社会的意義も高い。
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