| 项目编号: | 1457686
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| 项目名称: | Collaborative Research: Does genetic load drive mating system evolution? Tests in an explicit historical context |
| 作者: | Laura Galloway
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| 承担单位: | University of Virginia Main Campus
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| 批准年: | 2014
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| 开始日期: | 2015-08-01
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| 结束日期: | 2018-07-31
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| 资助金额: | USD371778
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Biological Sciences - Environmental Biology
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| 英文关键词: | research
; ultimate driver
; plant mating system
; datum
; later evolution
; historical evolution
; variable mating system strategy
; excellent system
; evolutionary change
; mating system
; genetic load
; biological system
; research framework
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| 英文摘要: | This research will quantify the interplay between historical events and current natural selection in shaping plant mating system. Evolution is an ongoing process but depends strongly on the past. While nearly everyone acknowledges this fact, it has been difficult to quantify the relative importance of historical and current selection pressures as explanations of patterns in nature. This research will look at the factors that have determined the amount of self-pollination versus outcrossing in the American bellflower (Campanulastrum americanum). The project will immerse undergraduate and graduate students in the collection of next-generation DNA sequence data to reconstruct historical events and studies of current selective environment in the study species. Analyses of data from these disparate sources into a single, unified framework will provide a clearer understanding of the processes shaping complex patterns in nature, and yields a predictive framework that can be applied in any biological system. Broad dissemination of this predictive approach is valuable because it will help predict the response of species to increasingly altered environments in the modern age.
Plant mating systems are evolutionarily labile, ranging from highly outcrossing to highly inbreeding. This wide variation provides an excellent system for understanding the ultimate drivers of evolutionary change. Variable mating system strategies across levels of the biological hierarchy are commonly explained as adaptations to the current selective environment. A significant fraction of this variation, however, may reflect historical evolution in response to colonization during range expansion. This idea will be tested using Campanulastrum americanum, a North American herb in which preliminary data indicate reduced inbreeding depression and greater autogamy in sites where phylogeographic data suggest recent colonization. Using populations a range of distances from glacial refugia, the researchers will gather data with coalescent analysis of RAD-seq polymorphism, greenhouse studies of fixed and segregating genetic load, field studies of pollen limitation and reproductive assurance, and population-genetic inferences of selfing rates. Analyses of these data will determine whether initially non-adaptive processes associated with range expansion provided a permissive environment for later evolution of the mating system. The research framework therefore provides a mechanism for discerning the ultimate drivers of organismal change across past and present time scales. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/93782
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Laura Galloway. Collaborative Research: Does genetic load drive mating system evolution? Tests in an explicit historical context. 2014-01-01.
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