Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 9224185 |
| Dissertation Research: Systematics and Biogeography of Mentzelia (Loasaceae): A North and South American Desert Disjunct | |
| [unavailable] | |
| 主持机构 | University of Texas at Austin |
| 开始日期 | 1993-03-01 |
| 结束日期 | 1995-02-28 |
| 资助经费 | 10000(USD) |
| 项目类别 | Standard Grant |
| 资助机构 | US-NSF（美国国家科学基金会） |
| 项目所属计划 | PHYLOGENETIC SYSTEMATICS |
| 语种 | 英语 |
| 国家 | 美国 |
| 英文简介 | Mentzelia, one of the few New World amphitropical plant disjuncts proposed to have originated in North America, will be examined for genetic divergence and phylogenetic relationships by graduate student Alice Hempel, under the supervision of adviser Robert Jansen at the University of Texas. Examination of such New World disjunctions using DNA restriction site information has not been done previously. The use of chloroplast DNA, nuclear ribosomal DNA and morphological data will generate three independent data sets to investigate the potential processes leading to the current distribution such as long distance dispersal, vicariance events, relict distributions and convergent evolution. Disjunct species and genera have been comparatively well documented between the arid lands of North America and South America, but no robust phylogenies exist for these taxa to interpret the biogeographical processes. This project is designed to answer systematics questions such as the relationships between the three Loasaceae subfamilies, the sections in Mentzelia and species within sect. Mentzelia, which contains the majority of South American species. A revision of sect. Mentzelia, including molecular, chromosomal and SEM seed coat data is needed to complete a modern revision of the genus. Morphological and molecular data will be analyzed both separately and integrated, using parsimony methods. The resulting phylogenetic trees and measures of genetic divergence will be used to evaluate the hypotheses regarding the present distribution of Mentzelia. |
| 来源学科分类 | Biological Sciences |
| URL | https://www.nsf.gov/awardsearch/showAward?AWD_ID=9224185 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/341035 |
| 推荐引用方式 GB/T 7714 | [unavailable].Dissertation Research: Systematics and Biogeography of Mentzelia (Loasaceae): A North and South American Desert Disjunct.1993. |
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