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.

遮荫回避综合症是植物对叶片遮荫的反应而提早伸长和开花的能力，是表型可塑性的一个重要的生态和农业例子，它可能有助于植物在一系列光照条件下的持久性。尽管遮荫回避综合征具有明显的适应价值，但该综合征在许多物种的种群之间存在差异。功能论证表明，选择可能有利于开放树冠位置的遮荫回避，而不是封闭树冠位置的遮荫。在这里，我们将对一年生植物凤仙花的7对开阔树冠和林地种群的避荫种群分化进行研究。通过比较不同冠层类型和不同地点的数量性状变异和中性标记变异，来检验分化在遮荫回避中的适应性意义。对遮荫的潜在限制将通过测试与遮荫相关的性状和与其他生命阶段的光敏感相关的性状之间的遗传相关性来检验。这项研究将提高我们对生态和农业重要特征的理解，并将通过促进分子工具培训和促进不同机构的生态遗传学家和系统学家之间的合作来丰富研究生教育。