Phylogenetic analysis of the plants which experienced evolutionary radiation in East Asia

东亚经历进化辐射的植物的系统发育分析

• 批准号: 22570097
• 负责人: SOEJIMA Akiko
• 金额: $ 3万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2013-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22570097/
• 关键词: 生物系統地理; 倍数体進化; 東アジア; 放散的種分化; 種分化; 細胞地理学; 分子系統解析; 東アジアフロラ; 国際情報交換

In Flora of China, they recognize one species and eleven varieties in the Aster ageratoides complex in China. However, our study proposes to marge them into about three taxa. On the other hand, we recognize six species and four varieties in Japan, which suggests that evolutionary radiation might have occurred rather in Japan. It is possible that the complicated landform of Japan blocked gene flow between populations and accelerated speciation, while continuous landscape in continent permitted more frequent gene flow so that the distribution area of a taxon could be wider in China.Unfortunately, it is difficult do reveal phylogenetic relationship between the taxa of A. ageratoides complex because their genetic differentiation is too small to reconstruct a phylogenetic tree. But we consider the small genetic differentiation itself reflects the recent, rapid evolutionary radiation of this group.

在《中国植物志》中，他们识别出中国紫菀复合体中的一个种和十一个变种。然而，我们的研究建议将它们分为大约三个分类单元。另一方面，我们在日本发现了六个物种和四个变种，这表明进化辐射可能发生在日本。日本复杂的地形可能阻碍了种群之间的基因流动并加速了物种形成，而大陆连续的景观允许更频繁的基因流动，从而使中国分类单元的分布范围更广。不幸的是，很难揭示苋菜复合体类群之间的系统发育关系，因为它们的遗传分化太小，无法重建系统发育树。但我们认为，微小的遗传分化本身反映了该群体近期快速的进化辐射。