2021 Fiscal Year Final Research Report

Evolutionary differentiation and pollination system in distylous tree, Schoepfia jasminodora (Schoepfiaceae)

Research Project

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Project/Area Number	19K06825
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 45030:Biodiversity and systematics-related
Research Institution	National Museum of Nature and Science, Tokyo (2020-2021) Tokyo Metropolitan University (2019)
Principal Investigator	Sugawara Takashi 独立行政法人国立科学博物館, 植物研究部, 客員研究員 (10226425)
Co-Investigator(Kenkyū-buntansha)	内貴章世琉球大学, 熱帯生物圏研究センター, 准教授 (30393200) 渡邊謙太沖縄工業高等専門学校, 技術室, 技術専門職員 (50510111)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	ボロボロノキ / 二型花柱性 / 送粉様式 / 花香成分 / 遺伝的分化 / ガ媒花 / ハナバチ媒花
Outline of Final Research Achievements	To understand the actual condition of pollination and genetics in a distylous species of Schoepfia jasminodora, we investigated flower visitors, composition of floral volatiles and genetic differentiation by using several populations occurring in Japan. 1) It was confirmed that the populations from Nansei Islands were pollinated by small night moths while the populations from kyushu District were pollinated by small night moths and bumblebees. 2)Floral volatiles were mainly composed of phenylpropanoid and did not differ among the populations of Kyushu District and Nansei Islands. 3)STRUCTURE analysis indicated that the populations of Kyushu District were clearly differentiated from the populations of Nansei Islands. 4) The pollination system matched a genetic differentiation, but did not coincided with a composition of floral volatiles.
Free Research Field	植物分類学、送粉・繁殖生物学
Academic Significance and Societal Importance of the Research Achievements	本研究は、二型花柱性という特異な繁殖システムをもつボロボロノキの送粉様式、花香成分、遺伝的分化について解析し、その送粉様式や遺伝的特性が地理的分布に対応して変化していることを示した成果である。このような例は二型花柱性植物ではあまり報告がなく、特にガ媒花的植物においては学術的にも興味深い成果である。そもそも本種の繁殖様式については、雌雄異株と捉えられるなど、その繁殖の実態が正しく理解されていなかった側面がある。送粉様式を含めた繁殖様式の実態解明は、希産地域での本種の保全を進めていく上でも意義のある成果と考える。