| Project/Area Number |
17405028
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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 | 海外学術 |
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| Research Field |
林学・森林工学
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| Research Institution | The University of Tokyo (2006-2007)
Kanazawa University (2005) |
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Principal Investigator |
KAMATA NAOTO The University of Tokyo, GRADUATE SCHOOL OF AGRICULTURAL AND LIFE SCIENCFS, ASSOCIATE PROFESSOR (90303255)
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| Co-Investigator(Kenkyū-buntansha) |
MITSUNAGA TORU GIFU UNIVERSITY, 応用生物科学部, Associate Professor (20219679)
HAMAGUCHI Keiko Forestry and Forest Products Research Institute, 関西支所, SENIOR RESEARCHER (60343795)
GOTO Hideaki Forestry and Forest Products Research Institute, 九州支所, SENIOR RESEARCHER (10353682)
MASUYA Hayato Forestry and Forest Products Research Institute, 森林徴生物研究領域, SENIOR RESEARCHER (70391183)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥12,310,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥810,000)
Fiscal Year 2007: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2006: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2005: ¥6,200,000 (Direct Cost: ¥6,200,000)
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| Keywords | the Javanese oak wilt / Platypus quercivorus / Raffaelea quercivora / Quercus crisnula / DNA analysis / invasive species / hijack / coevolution / 侵入生物 / 地理的変異 / Platypus koryoensis / Platypus taiheizannesis / DNA / フェロモン / 地理的変移 / platypus koryoensis |
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| Research Abstract |
Before starting this project, Platypus quercivorus was recorded from Japan, India, Indonesia, New Guinea, and Taiwan. We collected the species from Thailand and Vietnam, which is the new record of the distribution of this species. We found that two types were distributed in Japan, which were thought to be two independent species ("Japan-Sea type" and "Pacific -Ocean type" in this MS). These two types differed from each other morphologically and genetically. These morphological and genetic differences coincided. Regarding the "Japanese-Sea type" two populations were recognized by DNA analysis: mainland population and central Ryukyu population. Genetic distance between the two populations was farthest among four regional populations by DNA analysis including Thai and Indonesian populations. The mainland population was most close to Thai population, and the central Ryukyu population was to the Indonesian. It was difficult to explain this result by natural pattern. The mainland population was introduced from Thailand after the last glacier age probably by human activity. On contrary, the pathogenic fungus, Raffaelea quercivora did not varied so much as P quercivorus did: R. quercivora that was collected from P quercivorus in Taiwan and Japan were classified into one trade. We hypothesized an origin of the Japanese oak wilt disease as follows: Japan-Sea-type P quercivorus that were introduced from Thailand after glacier age were hijacked by R. quercivora carried by the Pacific-Ocean type at southern Kyushu, in which these two types coexist. Because Quercus crispula is highly susceptible to R. quercivora and because reproduction rate of P quercivorus is high in dead Q. crispula, epidemics of the Japanese oak wilt spread rapidly and the distribution range of the Thai population of the "Japan-Sea-type" P. quericovrus expanded fast
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