Synthetic Study on Gondwana Plants in circum-South Pacific

在本研究计画中，我们分析了分布在南美洲和大洋洲地区的植物类群，以及在这些地区的多样性。我们采用分子系统学、比较形态学和古植物学的方法来阐明冈多瓦纳植物的物种形成和分布模式。伊藤对南半球广泛分布的石蒜科植物进行了分子系统学研究，认为石蒜科植物起源于非洲，分布于各地区的植物为单系植物。上田分析了南美特有的Gomortega。Setoguchi和Asakawa研究了金合欢科（Nothofagaceae）和南洋杉科（Araucariaceae）这两个典型的冈多瓦纳植物群。因此，在假法格科，单系分支，对应于他们的花粉形态是公认的，在南洋杉科，每个传统的属成为单系，但在每个属中发现了一些突变，特别是在新喀里多尼亚的植物，这表明他们最近的起源。Nishida研究了来自澳大利亚Queesland Home Dare的舌羊齿化石。他和他的学生详细描述了雄性和雌性的生殖器官，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.