Systematic study on the origin and process of distribution of higher plants in the Sino-Japanese region

本文对中日地区分布较广的几个植物类群鱼腥草（Houttuynia cordata）、尼泊尔芦笋（Rumex nepalensis）以及苏铁和根科（phyllodoaceae）几个属进行了系统地理学研究。滇西北鱼腥草和尼泊尔芦梅cpDNA单倍型的地理分布显示出明显的东西地理界限。滇西北地区的地理特征是由第三纪印度大陆与欧亚大陆碰撞造成的喜马拉雅剧变形成的南北三大河和河流之间的高山山脉。本文认为，中、日地区广泛分布的植物在滇西北地区第三纪地理事件后被划分为东、西两部分，并且在遗传上是分离的。日本、琉球群岛和台湾的植物类群在中国东部具有相同的单倍型，岛屿和大陆之间没有遗传分化。

We investigated phylogeography on several widely distributed plant taxa in Sino-Japanese region, Houttuynia cordata, Rumex nepalensis and several genera, Cycas and Phyllodoce. Geographic distribution of cpDNA haplotypes found in Houttuynia cordata and Rumex nepalensis shows clear geographic barrier demarcated east and west at North West Yunnan Province in China. The geography of NW Yunnan is characterized three big river running from north to the south and high mountain range between the rivers, which formed by upheaval of Himalayas attributed to collision of the Indian Continent and the Eurasian Continent in the Tertiary. We estimate that widely distributed plants in Sino-Japanese Region were divided west and east at NW Yunnan after the geographical event in Tertiary, and genetically isolated. These plant taxa in Japan, the Ryukyu islands and Taiwan share the same haplotypes in the eastern China, no genetic differentiation was recognized between the islands and the continent.