Dissertation Research: Phylogeny and Biogeography of Paeonia (Paeoniaceae)

9321616观赏牡丹和它们的野生近缘，归入牡丹属，多年来一直令植物学家着迷和困惑。牡丹结合了原始和高级的形态特征，在系统发育上与许多不同的双子叶植物类群有关，但它们之间的进化关系仍未解决。在俄亥俄州立大学教职顾问托德·斯图西博士的指导下，研究生陶桑正在新大陆和东半球进行广泛的田野工作，为该属约30个物种的详细形态和DNA分析收集材料。来自叶绿体DNA和核糖体DNA的新分子数据有望为系统发育推断提供强大的特征。反过来，来自形态和分子证据的严格扎根的系统发育将允许分析目前北半球牡丹分布的有趣的、分离的地理范围。将收集新的分子和形态证据来研究牡丹属的系统发育和生物地理学，牡丹属是一组迷人的广泛分布的灌木，具有观赏和药用特性。

9321616 Stuessy The ornamental peonies and their wild relatives, placed in the isolated genus Paeonia, have fascinated and puzzled botanists for many years. Combining primitive and advanced morphological features, peonies have been related phylogenetically to numerous disparate groups of dicots but their evolutionary relationships remain unresolved. Under the direction of faculty adviser Dr. Tod Stuessy at Ohio State University, graduate student Tao Sang is conducting extensive field work in both the New and Old Worlds to amass materials for detailed morphological and DNA-based analyses of the ca. 30 species in the genus. New molecular data from chloroplast DNA and nuclear ribosomal DNA promise to yield robust characters for phylogenetic inference. In turn, a rigorously grounded phylogeny from morphological and molecular evidence will permit the analysis of intriguing disjunct geographical ranges in the present distribution of peonies in the northern hemisphere. New molecular and morphological evidence will be collected to study the phylogeny and biogeography of Paeonia, a fascinating group of widely distributed shrubs, with ornamental and medicinal properties.