Dissertation Research: A Systematic Study of Tribe Neillieae (Rosaceae)

0073041 Potter和Oh许多仅分布于东亚和北美温带的植物群长期以来一直吸引着植物学家的兴趣，并在过去的两个世纪中成为许多分类学，地理学和进化研究的主题。 尽管有着悠久的历史和最近的一些系统发育研究，这些植物群的地理历史尚未得到很好的建立。 Neillieae族由Neillia、Physocarpus和Stephanandra三个分类学上较困难的属组成，分布于亚洲东部和北美东部和西部，通常分布在山区。 Neillieae族是东亚和北美温带地区历史地理研究的理想类群，其特征是：该族是一个强有力的自然类群，其分布在各大洲可划分为多个区域，其物种数量少（约100种），其分布在东亚和北美温带地区的地理分布也较广。25)使用一系列现代系统发生学方法来促进各种数据的分析。 然而，尚未对这一群体进行全面系统的研究。 在加州大学戴维斯分校丹尼尔波特博士的指导下，研究生吴相勋正在利用形态学和分子数据研究Neillieae部落的系统发育关系。 四个DNA区域，包括核和叶绿体基因组，为所有种在族Neillieae将进行分析沿着与形态特征，以估计一个最大限度地强大的系统发育框架。将使用这个系统发育框架，结合目前的分布模式和化石记录的部落Neillieae的生物地理历史进行评估。 一个健全的分类系统，反映了族Neillieae成员的进化关系的分类修订也将提供。 Neillieae族的历史地理将为了解东亚-北美间断分布格局是如何形成的以及何时形成的提供重要信息。 此外，考虑到Neillieae植物在园艺上的用途，本研究将为种质资源筛选和观赏新品种开发提供有价值的信息。 最后，通过整合Neillieae族的几个近亲，本项目中产生的数据将有助于阐明蔷薇科，一个进化上复杂和经济上重要的植物家族内的进化关系。

0073041Potter and OhMany plant groups distributed only in eastern Asia and temperate North America have long attracted the interest of botanists and have been the subject of numerous taxonomic, biogeographic, and evolutionary studies over the past two centuries. Despite this long history of interest and several recent phylogenetic studies of such plant groups, their biogeographic history has not yet been well established. Tribe Neillieae, comprising three taxonomically difficult genera, Neillia, Physocarpus, and Stephanandra, is distributed in eastern Asia and both eastern and western North America, usually in mountainous regions. Tribe Neillieae possesses ideal characteristics for studying historical biogeography of eastern Asia and temperate North America: the tribe is a strongly supported natural group, its distribution can be dissected into many areas in each continent, and its small number of species (ca. 25) facilitiates the analysis of a variety of data using a range of modern phylogenetic methods. However, no comprehensive systematic study of the group has yet been undertaken. Graduate student Sang-Hun Oh, under the direction of Dr. Daniel Potter at University of California, Davis, is studying phylogenetic relationships of the tribe Neillieae using morphological and molecular data. Four DNA regions, encompassing both nuclear and chloroplast genomes, for all species in tribe Neillieae will be analyzed along with morphological characters to estimate a maximally robust phylogenetic framework. Biogeographic history of the tribe Neillieae will be evaluated using this phylogenetic framework in conjunction with current distribution patterns and fossil records. A taxonomic revision with a sound classification system that reflects evolutionary relationships of the members of tribe Neillieae will also be provided. The historical biogeography of tribe Neillieae will provide important information relevant to understanding how and when the eastern Asian-North American disjunct distribution pattern developed. In addition, considering that plants of Neillieae are horticulturally useful, this study will provide valuable information for screening germplasm and developing new ornamental cultivars. Finally, by integrating several close relatives of the tribe Neillieae, data produced in this project will contribute to illuminating the evolutionary relationships within Rosaceae, an evolutionarily complex and economically important plant family.