2023 Fiscal Year Final Research Report
Reproductive interference between native and alien plant species in paddy field
| Project/Area Number |
20K06099
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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 39060:Conservation of biological resources-related
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| Research Institution | Tokyo University of Agriculture |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 水田生態系 / 外来生物 / 遺伝的攪乱 / 種間交雑 / 繁殖干渉 / 生物間相互作用 |
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| Outline of Final Research Achievements |
The present study revealed that about 75 years after the accidental introduction of E. alba into Japanese rice paddies, its geographical distribution has spread over a wide range of Japan. The invasion of E. alba resulted in interspecific hybridization with closely related native species, E. thermalis, and a large number of later-generation hybrids have been generated. In addition, artificial pollination experiments and microsatellite genotyping clarified that the deposition of heterospecific pollen grains on the stigma surface resulted in both quantitative and qualitative reduction of seed production. We considered that frequency-dependent pollination-mediated interactions, e.g., demographic and genetic swamping, seems to play an important role in the reduced dominance of E. thermalis.
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| Free Research Field |
保全生態学
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| Academic Significance and Societal Importance of the Research Achievements |
水田生態系を対象として、送粉を介した種間相互作用について検証したのは本研究が初めてである。これまで類似の研究がおこなわれなかったのは、水田に生育する植物の多くが自家和合性を持っており、そのような植物は干渉作用を受けにくいと考えられてきたためだろう。今回、自殖が卓越するタカサブロウ属植物でも一定程度の干渉作用が確認されたことは、送粉を介した種間相互作用と自家和合性との関係について再検討を促し、外来植物による在来植物への影響を再評価するとともに、水田生態系の保全対策に基礎的知見を与えるなど、学術的・社会的に大きな意味を持っている。
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