| Project/Area Number |
22K15171
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 45030:Biodiversity and systematics-related
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| Research Institution | Chiba University (2023)
The University of Tokyo (2022) |
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Principal Investigator |
ニッタ ジョエル 千葉大学, 大学院国際学術研究院, 准教授 (50901443)
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| Project Period (FY) |
2022-04-01 – 2027-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2026: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2025: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2024: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | fern / endemic / flow cytometry / Okinawa / Amami-Oshima / Iriomote / Odontosoria / シダ植物 / 琉球列島 / 固有種 / 系統解析 |
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| Outline of Research at the Start |
ダーウィンを始め生物学者たちは、以前より島を「進化の実験室」として重視してきた。日本の島の中でも琉球列島には特に固有種の数が多く、進化の過程を研究する上で重要な地域である。本研究では、琉球列島に固有のシダ植物の生物地理的な歴史・起源を解明することを目的とする。特に、琉球列島の形成過程において台湾との地理的な繋がりがあったことから、台湾のシダ植物との関係を検討する。本研究は以下の二本柱で進める。一つは琉球列島と台湾と両方に分布する種の集団遺伝学解析であり、もう一つは琉球列島固有種の生物地理解析である。二つの方法を用いることによって、琉球列島固有種の起源をより解像度高く解明することを期待している。
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| Outline of Annual Research Achievements |
Sampling was carried out in Amami-Oshima in February 2024 and Iriomote in March 2024. Odontosoria minutula, an endangered species endemic to Amami-Oshima, was successfully collected. Multiple individuals were collected from Iriomote that do not conform well in morphology to any known species. There is a possibility that these are undescribed species or hybrids. About 50 specimens were collected in total and subjected to ploidy analysis using flow cytometry. A presentation on the research was given at the 23rd annual meeting of the Japanese Society for Plant Systematics in Sendai in March 2024.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The high degree of morphological diversity observed in specimens from Iriomote was unexpected. Additional fieldwork may be needed to confirm the status of any new taxa. Although flow cytometry results are consistent, they need to be cross-checked with microscopic observation of chromosomes.
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| Strategy for Future Research Activity |
Next steps include additional sampling of Odontosoria specimens in Okinawa (Ishigaki and Okinawa islands; Winter 2024), initial genetic screening using PCR of plastid regions (Fall and Winter 2024), sending out specimens for sequencing via sequence capture (Winter 2024 ~ Spring 2025), then analyzing data and publishing papers (2025 onward).
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