Understanding apparently maladaptive floral morphology as genetic diversity maintained through balancing selection
| Project/Area Number |
15K14592
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 集団内変異 / 集団間変異 / 四倍体 / 二年生草本 / 生活史 / ロゼット / 花形態 / 平衡選択 / CYCLOIDEA(CYC) |
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| Outline of Final Research Achievements |
Aster hispidus species complex and A. kantoensis have been considered biennial and semelparous. However, I had found aerial rosettes at the base of the flowering stems (hereafter referred to as post-flowering rosettes) in some of those taxa. which suggested the potential for iteroparity. I hypothesized that the post-flowering rosettes are adaptive in disturbed environments where most of the study species are distributed. Individual tracking and between-population comparison, I revealed that the post-flowering rosettes indeed contributed to reproduction in the next generation, and that the post-flowering rosettes were more frequently observed in disturbed habitats (e.g., floodplain and serpentine area).
Moreover, we performed population genetic analyses using SNPs obtained by ddRAD-seq method to reveal genetic relationships among A. hispidus species complex and related species. The results showed that traditional morphological classification is not consistent with genetic relatedness.
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| Academic Significance and Societal Importance of the Research Achievements |
ヤマジノギク種群・カワラノギクは繁殖回数進化のよいモデルとなる可能性を示すとともに開花株ロゼットが保全上も重要な生活史上のステージであることを示した。
また、ヤマジノギク種群・近縁種は、日本固有分類群を含み、河原や蛇紋岩地、岩場や海岸といった多様な環境に適応している。本研究では、ツツザキヤマジノギクの近縁分類群との遺伝的関係が明らかになっただけでなく、ヤマジノギク種群・近縁種の生態的種分化研究や保全生態学研究の材料としての基盤を築くことができた。
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Report
(6 results)
Research Products
(9 results)
