2007 Fiscal Year Final Research Report Summary
Research on the tree treatment techniques based on the self-defense systems of trees
| Project/Area Number |
16380096
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学・森林工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMADA Toshihiro The University of Tokyo, Graduate School of Agricultural and Life Sciences, Professor (30332571)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUDA Kenji The University of Tokyo, Graduate School of Frontier Sciences, Professor (30208954)
ITO Shin-ichiro Mie University, Faculty of Bioresoures, Professor (90092139)
MITSUNAGA TORU Gifu University, Faculty of Applied Biological Sciences, Associate Professor (20219679)
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| Project Period (FY) |
2004 – 2007
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| Keywords | tree / defense response / wounding / stress / pathogenic fungus / treatment / wood discoloration and decay / decline |
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| Research Abstract |
Stem wounding onto four tree species generally showed slow enlargement of wood discoloration in autumn and winter wounding, and rapid enlargement in summer wounding. Wood discoloration enlarged rapidly under water stress in dieback fungus-inoculated Cryptomeria japonica seedlings, indicating water stress has a great impact on wood discoloration. Controlled wetness of wound surface of Zelkova serrata revealed that keeping the wetness of wound suppressed the size and degree of wood discoloration. These results indicate that season, water stress and wound surface condition affect the enlargement of wound-induced wood discoloration.
Inoculation of four Fagaceae species with Japanese oak wilt fungus Raffaelea quercivora showed that non-conducting area and wood discoloration related to the susceptibility of host tree species, and that suberin-response was conspicuous in resistant tree species, thus the defense responses differ from those of susceptible species. Inoculation of R. quercivora in various seasons showed that non-conducting area enlarged most widely in June to July in susceptible Quercus crispula, and that the area was similar to wound control in resistant Q. glauca. Relationship of susceptibility to each fungal isolate with tree age was different between susceptible and resistant tree species in the inoculation test using seedlings and mature trees of Q. crispula and Q. glauca. Wetness of wound did not affect the enlargement of wood discoloration in dieback fungus-inoculated C. japonica seedlings. These results suggested that pathogenic fungi transformed the effects of tree age, season, water stress and wound condition on wood discoloration.
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