2023 Fiscal Year Final Research Report
zygomorphy as a mechanism of floral diversification in angiosperms
| Project/Area Number |
19K16210
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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 | Aichi University of Education |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 繁殖干渉 / 繁殖様式 |
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| Outline of Final Research Achievements |
In the process of angiosperm diversification, we aimed to investigate the potential for shifts in reproductive systems through the evolution or loss of zygomorphy. Initially, we hypothesized that in mixed populations with invasive species, the visitation frequency to Veronica undulata would decrease, potentially leading to changes in its reproductive strategy and floral morphology. However, when we conducted removal of invasive species in mixed populations, we observed changes in the visiting insect community of native species but did not find significant changes in visitation frequency itself. On the other hand, in populations with lower visitation frequencies, we observed extended stamen-pistil contact time, increased seed production, and decreased seed number variability. This suggests that veronica undulata populations may alter their flowering characteristics in response to visitation frequency.
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| Free Research Field |
生物多様性・分類
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| Academic Significance and Societal Importance of the Research Achievements |
被子植物の進化には、花形態の多様化が大きく関わっていると考えられている。本研究では、花形態の左右相称性に着目し、訪花頻度に応じて、左右相称性と放射相称性がスイッチするのではないかと考えた。研究より、同種内の11集団間で左右相称性に有意な違いはみられなかったものの、訪花頻度が低い集団では雄しべと雌しべの接触時間が長くなり、種子数の増加とバラつきが小さくなる傾向が見られた。このことは、訪花頻度が自然選択となり花の開花特性が変化することで、被子植物が環境に応じて自殖と他殖の割合を調整している可能性を示唆し、繁殖戦略のパラドックスと考えられてきた自殖と他殖を両立するしくみを解く鍵となる研究になりうる。
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