| Project/Area Number |
15580134
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Nihon Fukushi University |
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Principal Investigator |
FUKUDA Hideshi Nihon Fukushi University, Fac. of Social & Information Technology, Associate Professor, 情報社会科学部, 助教授 (50319307)
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| Co-Investigator(Kenkyū-buntansha) |
HIJII Naoki Nagoya University, Graduate school of bioagricultural Sciences, Associate Professor, 大学院・生命農学研究科, 助教授 (80202274)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2003: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Urocerus japonicus / symbiotic fungus / Amylostereum laevigatum / percentage of isolation / inoculation season / propagation status / Cryptomeria japonica / discoloration area / ニホンキバチ / Amylostereum laevigatum / C / N比 / N含有量 / スギ / 材内生存期間 |
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| Research Abstract |
Woodwasps are symbiotically associated with Amylostereum fungus spp. Adult females inoculate the fungus during oviposition on sapwood of host trees. Aided by fungal symbiosis, woodwasp larvae can digest sapwood with low nutritional value. Urocerus japonicus, a fungus-carrying woodwasp, oviposits selectively on freshly felled Japanese cedar trees that are presumed to be suitable for propagation of the fungal symbiont. We investigated the potential for growing U. japonicus in old trees by propagating Amylostereum laevigatum in the wood before woodwasp oviposition. Oviposition activity levels were higher on oviposited trees (fungus-inoculated by another woodwasp before oviposition) and on artificially inoculated trees (fungus-inoculated artificially before oviposition) than on control trees. Next-generation adults emerged from artificially inoculated trees but not from previously oviposited and control trees. These results suggest that U japonicus can utilize fungus already propagating in wood. Moreover, we investigated the effect of inoculation season on fungus propagation in the wood. Clear wood discoloration was recognized in summer-inoculated trees but there was almost no discoloration in fall-inoculated trees. In summer-inoculated trees, fungus propagated mainly in discolored areas; in fall-inoculated trees, it propagated widely irrespective of discoloration. These results suggest that fall-inoculated trees would be best for growing these woodwasps.
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