2022 Fiscal Year Final Research Report
The expansion mechanism of annual ryegrass into sandy coasts in Japan
| Project/Area Number |
20K06092
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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 | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 外来植物 / 侵入経路 / 分布拡大 / ドクムギ属 / 砂浜海岸 |
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| Outline of Final Research Achievements |
The Lolium species, a widespread alien in Japan, are introduced to Japan through unintentional pathways of contaminants in grain commodities and intentional pathways of commercial cultivars for fodder crops or revegetation materials. From population genetic analysis, it has been estimated that those who introduced by unintentional pathways spread to sandy coasts, and those who introduced by intentional pathway spread to croplands.
To understand the mechanism that causes such differences in distribution patterns, a survey of the distribution of Lolium species on sandy coasts and croplands throughout Japan, a transplant experiment on a sandy coast, assessments of individual drought tolerance and competitive ability, and seed mortality in buried soil were conducted.
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| Free Research Field |
植物生態学
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| Academic Significance and Societal Importance of the Research Achievements |
（1）侵略的外来植物の種特性の解明は多数行われてきたが、現地でどのような選択圧が働き、どのような形質が重要か、といった因果関係まで明瞭に示した研究例は少ない。本研究は砂浜海岸と農耕地に広く生育するドクムギ属を対象に、各生育地への分布拡大に重要な形質および選択圧を明らかにすることを目的とする。
（2）砂浜海岸は現在、生物多様性が失われつつある生態系の１つである。周辺環境の開発による砂浜面積の減少や、砂浜への外来植物の侵入が問題となっている。砂浜海岸へ分布拡大する外来植物の特徴を明らかする本研究は、希少な生態系となりつつある砂浜海岸の保全に貢献するものである。
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