DISSERTATION RESEARCH: Systematics and Biogeography of the tribe Vanilleae (Orchidaceae), and a monograph of the genus Epistephium

论文研究：香草族（兰科）的系统学和生物地理学，以及 Epistephium 属的专着

• 批准号: 1501940
• 负责人: Kenneth Cameron
• 金额: $ 1.9万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-05-01 至 2017-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1501940&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Systematics; Biogeography; tribe

The orchid family may be the largest family of flowering plants, with dozens of new species being described each year, mostly from the tropics. This research will contribute to be a better understanding of the orchid family by focusing on the poorly known neotropical genus, Epistephium. Researchers will first reconstruct phylogenetic relationships within the genus, and then use the resulting phylogeny to conduct a species-level systematic revision. One graduate student and several undergraduates will be trained in systematic revisionary studies and molecular phylogenetics. International research infrastructure will be enhanced through collaborations with researchers in Ecuador and Brazil. The research also offers to provide new insights into evolutionary relationships within the Vanilloideae subfamily, that contains the economically important genus, Vanilla.This project aims to fully resolve the phylogenetic relationships of the tribe Vanillieae, which encompasses most tropical representatives of the subfamily Vanilloideae. Researchers will employ next-generation sequencing approaches to collect large amounts of DNA sequence data from all genera in the tribe and facilitate reconstruction of a highly supported phylogenetic tree. The resulting phylogenetic hypothesis will in turn allow a deeper analysis of the current and historical biogeographic distribution of the tribe (involving two examples of trans-Atlantic disjunctions and the opportunity to study island biogeography in the Pacific and SE Asia). Phylogenetic tests for vicariance and long distance dispersal will then be conducted out to identify how the group attained its current distribution. Lastly, a species-level monograph of Epistephium, the second largest genus in the tribe, will be produced.

兰花家族可能是最大的开花植物家族，每年都描述了数十种新物种，主要来自热带地区。这项研究将通过关注鲜为人知的新热带属Epistephium来更好地理解兰花家族。 研究人员将首先重建属内的系统发育关系，然后使用最终的系统发育进行物种级的系统修订。一名研究生和几个本科生将接受系统的修订研究和分子系统发育学的培训。通过与厄瓜多尔和巴西的研究人员的合作，将增强国际研究基础设施。这项研究还提供了对香草酸盐亚科中进化关系的新见解，其中包含经济上重要的属，即香草。该项目旨在充分解决部落香草虫的系统发育关系，其中包含了亚家族香草的最热带代表。研究人员将采用下一代测序方法来从部落中所有属的所有属中收集大量DNA序列数据，并促进重建高度支持的系统发育树。由此产生的系统发育假说将又可以更深入地分析部落的当前和历史生物地理分布（涉及两个跨大西洋分离的例子，以及在太平洋和SE亚洲研究岛屿生物地理学的机会）。然后将进行用于替代性和长距离分散的系统发育测试，以确定该组如何达到其当前分布。最后，将生产一个物种水平的epistephium，是该部落的第二大属。