2022 Fiscal Year Final Research Report
Diversification process of photoperiodic flowering in Lemna genus
Project/Area Number |
20K15861
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 45030:Biodiversity and systematics-related
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Research Institution | Kagoshima University |
Principal Investigator |
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Project Period (FY) |
2020-04-01 – 2023-03-31
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Keywords | 光周性 / 概日時計 / アオウキクサ属 / 花成 / 局所適応 |
Outline of Final Research Achievements |
Flowering and fruiting are the most important events in the life history of plants. Flowering time is therefore an important trait for both taxonomy and ecology. Photoperiodism, which is based on photoperiod measurement via the circadian clock, is an important factor in determining flowering seasons. Long-day (spring-blooming) and short-day (autumn-blooming) plants are observed in various taxa, but its diversification process is still unknown. In this study, two closely related species of the genus Lemna, Lemna gibba (long-day) and Lemna aequinoctialis (short-day) were analized. These two species have been used for photoperiodic analysis for a long time. There were long-day-inducible and short-day-inducible FT genes. It was suggested that the proper use of these two genes is important for diversification fo photoperiodic resonse.
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Free Research Field |
植物時間生物学
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Academic Significance and Societal Importance of the Research Achievements |
四季の移ろいの美しさは、折々に咲く花による部分が大きい。開花季の多様化には様々な要因が複雑に絡むが、日長計測による光周性もその1つである。多くの分類群で、長日性(春咲き)・短日性(秋咲き)の両方が見られるため、進化的に光周性の逆転が起きていると考えられるが、その分子機構は不明な点が多い。本研究では、イボウキクサ(長日)・アオウキクサ(短日)という近縁の2種を用いて、光周性逆転の謎に迫った。その結果、花成ホルモンであるFT遺伝子に長日誘導型と短日誘導型の2つが存在し、その使い分けが逆転に関連することが示唆された。
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