Dissertation Research - Local Adaptation and Landscape Genetics of Plastic Shade Avoidance Responses in Impatiens capensis.

论文研究 - 凤仙花塑料避荫反应的局部适应和景观遗传学。

• 批准号: 0408015
• 负责人: Johanna Schmitt
• 金额: $ 1.19万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0408015&HistoricalAwards=false
• 关键词: Dissertation; Research; Local; Adaptation; Landscape

The shade avoidance syndrome, the ability of plants to elongate and flower earlier in response to foliage shade, is an ecologically and agriculturally important example of phenotypic plasticity that may facilitate plant persistence across a range of light conditions. Despite the apparent adaptive value of the shade avoidance syndrome, there is variation in the syndrome between populations of many species. Functional arguments suggest that selection may favor shade avoidance in open canopy sites but not closed canopy sites. Here population differentiation in shade avoidance will be examined in seven pairs of open canopy and woodland populations of the annual species Impatiens capensis. The adaptive significance of differentiation in shade avoidance will be tested by comparing quantitative trait variation to neutral marker variation partitioned between canopy types and among sites. Potential constraints on shade avoidance will be examined by testing for genetic correlations between traits related to shade avoidance and traits related to light sensitivity in other life stages. This research will improve our understanding of an ecological and agriculturally important trait, and will enrich graduate education by promoting training in molecular tools and fostering collaboration between ecological geneticists and systematists at separate institutions.

阴影回避综合征是植物对叶子阴影的延伸和花的能力，是表型可塑性的生态和农业重要的例子，可以促进跨多种光条件的植物持久性。尽管阴影回避综合征的适应性显而易见，但许多物种种群之间的综合征存在差异。功能性论点表明，选择可能有利于开放式顶篷站点的避免阴影，而不是封闭的顶篷站点。在这里，避免阴影的种群差异将以七对开放的树冠和木制种群的年度梗死。通过将定量性状变化与冠层类型之间和地点之间分区的中性标记变化进行比较，将测试避免阴影中分化的自适应意义。 通过测试与避免阴影相关的特征与与其他生命阶段相关的特征有关的特征之间的遗传相关性，可以检查避免阴影的潜在限制。这项研究将提高我们对生态和农业重要特征的理解，并通过促进分子工具的培训并促进不同机构的生态遗传学家和系统主义者之间的合作来丰富研究生教育。