2023 Fiscal Year Final Research Report
Species-specific characteristics of heartwood formation and Identification of infection pathways of heartwood-decaying fungi in deciduous broadleaved trees
| Project/Area Number |
20K06141
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 40010:Forest science-related
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| Research Institution | Akita Prefectural University (2021-2023)
The University of Tokyo (2020) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
山田 利博 東京大学, 大学院農学生命科学研究科(農学部), 教授 (30332571)
内海 泰弘 九州大学, 農学研究院, 准教授 (50346839)
山田 晋也 静岡県農林技術研究所, 静岡県農林技術研究所, 上席研究員 (20502579)
野末 尚希 静岡県農林技術研究所, 静岡県農林技術研究所, 主任研究員 (80738493)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 木部 / 心材 / 心材腐朽菌 |
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| Outline of Final Research Achievements |
To explore the mechanisms of heartwood formation in trees and to identify the infection pathways of heartwood-decaying fungi, four species of deciduous broadleaved trees, including those that form heartwood early, were planted in regions with different latitudes. The physiological changes in xylem were examined from the perspective of tree physiology. As a result, all species showed a tendency for greater growth in warmer regions. Xylem discoloration was observed approximately one year after planting in Aralia elata, and about two years after planting in Rhus javanica and Cerasus jamasakura. In the discolored areas of the xylem in R. javanica and C. jamasakura, living parenchyma cells were still observed, indicating that the discoloration was a preliminary stage of heartwood formation. When heartwood-decaying fungi were inoculated into the A. elata and R. javanica, hyphae were found in the vessels, wood fibers, and parenchyma cells of the discolored wood.
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| Free Research Field |
森林科学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究成果として、心材形成や心材腐朽に関する研究は、早期に心材形成するタラノキなどの広葉樹を活用することにより、木部の形成から心材に至るまでの木部の老化全体を考えていくことが可能になった。さらに木部の着色が認められた部位で心材腐朽菌類の侵入が認められたことから、心材腐朽菌類の侵入経路を予測する上で必要な知見が得られた。本研究は、街路樹の心材腐朽や菌類の検出方法を考えていく上での基礎研究として活用されていくと考えられる。
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