Synthetic Study on Gondwana Plants in circum-South Pacific

在本研究项目中，我们分析了南美洲和大洋洲地区分布的植物类群，并在这两个地区表现出多样性。我们采用了分子系统学、比较形态学和古植物学的方法来阐明冈多纳植物的物种形成和分布格局。伊藤研究了广泛分布于南半球的石蒜科植物的分子系统学，认为它们起源于非洲，干扰每个地区的植物是单叶植物。上田分析了南美洲特有的Gomortega。Setoguchi和Asakawa研究了紫草科和豆科，这两种植物都是典型的冈子科植物群。结果表明，与其花粉形态相对应的单系分支在罗汉果科中被识别出来，而在罗汉果科中，每个传统属都成为单系，但在每个属中都发现了一些突变，特别是在新喀里多尼亚的植物中，这表明它们的起源是最近的。西田研究了澳大利亚昆士兰州Home Dare的舌蕨化石。他和他的学生详细描述了雄性和雌性生殖器官，并讨论了它们的授粉策略。

In this research project, we analyzed the plant group which distribute both in South America and Oceania region, and diversified in these areas. We employed molecular systematical, comparative morphological and paleobotanical methodologies for clarifying the speciation and spreading patterns of Gondowana plants. Ito studied molecular systematics of Amaryllidaceae which distribute widely in south hemisphere and suggested their African origin and the plants disturbing each area are monophylteic. Ueda analyzed Gomortega which is endemic to South America. Setoguchi and Asakawa studied Nothofagaceae and Araucariaceae both of which are the typical Gondowana plant group. As a result, in Nothofagaceae, the monophyletic clades that correspond to their pollen morphology are recognized, and in Araucariaceae, each traditional genus became monophyletic, however a few mutations were found in each genus, especially in the plants of New Caledonia, and it suggests their recent origin. Nishida studied the permineralized fossil of Glossopteris from Home Dare, Queesland, Australia. He and his student described both male and female reproductive organ in detail and discussed their pollination strategies.