2023 Fiscal Year Final Research Report
Application of MIG-seq analysis to distinguish native and exotic populations of Lespedeza (Leguminosae) and to taxonomic revision
| Project/Area Number |
21K06322
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 45030:Biodiversity and systematics-related
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| Research Institution | Ishinomaki Senshu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
松尾 歩 東北大学, 農学研究科, 助教 (90868754)
陶山 佳久 東北大学, 農学研究科, 教授 (60282315)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | マメ科 / ハギ属 / ヤマハギ亜属 / MIG-seq解析 / ミヤギノハギ（広義） / ビッチュウヤマハギ / ケハギ / 国内外来種 |
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| Outline of Final Research Achievements |
Phylogenetic analyses focusing on Japanese species of Lespedeza (Leguminosae) were performed using the MIG-seq method, which allows comprehensive analysis of genetic variation across the entire genome. Most species formed clusters within each other. In L. thunbergii s.l. each intraspecific taxon showed a phylogenetic unity as an independent species. These results and seed morphology found did not support such taxonomic treatments as L. thunbergii s.l. or L. formosa s.l. It was also suggested that the horticultural species may have originated as a hybrid between L. thunbergii subsp. patens and L. thunbergii subsp. thunbergii f. angustifolia. Many Lespedeza species outside their natural distribution range were phylogenetically connected to populations in their natural distribution range, but in some cases, independent lineages seemingly exotic were detected. In addition, genetic differences were detected between isolated populations of L. thunbergii subsp. satsumensis and L. melanantha.
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| Free Research Field |
植物系統分類学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は、日本産マメ科ハギ属の種を中心に、多数の個体を材料に、遺伝的変異をゲノム全体にわたり網羅的に解析した最初の研究である。少数の遺伝子領域を用いたこれまでの系統解析とほとんど矛盾しない結果が得られたと同時に、さらに詳細で解像度の高い系統関係を明らかにした。この結果は、ミヤギノハギ（広義）の種内分類群の系統的な独立性を支持し、ミヤギノハギやシロバナハギといった園芸種については、ケハギとビッチュウヤマハギが関与する雑種起源の可能性を示唆した。また、道路法面緑化を目的に本来の分布域外に導入されている由来や分類の不確かなハギ類についても、国内外来種・外国産在来種の判定および系統学的帰属を解明した。
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