| Project/Area Number |
22255003
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KACHI Naoki 首都大学東京, 大学院理工学研究科, 教授 (30124340)
SEO Akihiro 京都大学, 大学院理学研究科, 研究員 (30378567)
SUGAWARA Takashi 首都大学東京, 大学院理工学研究科, 准教授 (10226425)
HAYASHI Fumio 首都大学東京, 大学院理工学研究科, 准教授 (40212154)
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| Co-Investigator(Renkei-kenkyūsha) |
MURATA Jin 東京大学, 大学院理学系研究科, 教授 (90134452)
YOKOTA Masatsugu 琉球大学, 理学部, 教授 (90166885)
KAJITA Tadashi 千葉大学, 大学院理学研究科, 准教授 (80301117)
KATO Hidetoshi 首都大学東京, 大学院理工学研究, 助教 (50305413)
SHIMIZU Akira 首都大学東京, 大学院理工学研究科, 助教 (10315749)
FURUKAWA Toshiko 首都大学東京, 大学院理工学研究科, 助教 (00221565)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥47,320,000 (Direct Cost: ¥36,400,000、Indirect Cost: ¥10,920,000)
Fiscal Year 2013: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2012: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
Fiscal Year 2011: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
Fiscal Year 2010: ¥20,410,000 (Direct Cost: ¥15,700,000、Indirect Cost: ¥4,710,000)
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| Keywords | 分類学 / 小笠原諸島 / 植物 / 植物地理学 / 進化 / 国際研究者交流 / フィリピン / 台湾 / パラオ / マレーシア |
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| Research Abstract |
In the present study, we conducted a molecular phylogeographic analysis of several taxa to elucidate the geographical origin of the species occurring in the Bonin Islands, Japan. We collected several plant materials from the Bonin Islands and its surrounding areas, such as the Ryukyus, Taiwan, the Philippines, Guam, and the Hawaiian Islands. Our phylogenetic results showed that Gynochthodes boninensis (Rubiaceae), endemic to the Bonin Islands is most closely related to G. parvifolia from Taiwan rather than G. umbellata, which was treated as the same species as G. boninensis. This result suggests that G. boninensis may have originated from a progenitor native to eastern Asia. Gynochthodes boninensis is reported to have an androdioecious sexual system, which is rare in flowering plants, whereas its closely relatives, G. parvipolia and G. umbellata are dioecious. The androdioecious sexual system of this species may have evolved from dioecy.
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