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Dissertation Research: The Maintenance of Genetic Variation for Phenotypic Plasticity: The Roles of Cost and Adaptation

论文研究：表型可塑性遗传变异的维持：成本和适应的作用

基本信息

批准号：
0206258
负责人：
Laura Galloway
金额：
$ 0.87万
依托单位：
University of Virginia Main Campus
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-07-01 至 2005-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206258&HistoricalAwards=false
关键词：
Dissertation Research Maintenance Genetic Variation

项目摘要

Phenotypic plasticity, the ability to adjust morphological traits in response to the environment, may enhance survival and reproduction in changing environments. Given this adaptive value of phenotypic plasticity, it is important to understand the mechanisms that may maintain genetic variation for plasticity. Despite the important theoretical role the cost of plasticity plays in maintaining this variation, relatively few empirical studies have focused on the role of cost of plasticity under natural conditions. This dissertation research will address this issue by examining the balance between the cost of plasticity and the benefit of plasticity under a variety of environmental conditions. Populations of the herbaceous plant Geranium carolinianum from both environmentally variable and uniform light environments are compared for the patterns of plasticity to natural variation in light availability. The genetic basis of plasticity will be assessed because the potential of phenotypic plasticity to evolve in response to future environmental change depends in part on its genetic basis. Finally, a field study will examine how selection may favor plasticity under environmentally variable conditions but favor non-plastic responses under uniform conditions. An increase in environmental variation is expected with global climate change. Understanding how plasticity is maintained is central to predicting population response to diverse environments.

表型可塑性，即根据环境调整形态特征的能力，可以提高在变化的环境中的生存和繁殖。考虑到表型可塑性的适应价值，理解可能维持遗传变异的可塑性的机制是很重要的。尽管重要的理论作用的可塑性成本在维持这种变化，相对较少的实证研究集中在自然条件下的可塑性成本的作用。本论文的研究将解决这一问题，通过研究在各种环境条件下的塑性成本和塑性效益之间的平衡。从环境变量和均匀的光环境的草本植物Germiscarolinianum的人口进行了比较的模式的可塑性自然变化的光可用性。可塑性的遗传基础将进行评估，因为表型可塑性的潜力，以应对未来的环境变化，部分取决于其遗传基础。最后，实地研究将探讨如何选择可能有利于可塑性在环境变化的条件下，但有利于非塑性反应在统一的条件下。随着全球气候变化，环境变化预计会增加。了解可塑性是如何维持的是预测人口对不同环境的反应的核心。