LiT: Genomic Analysis of Life-History Adaptation to Variation in Seasonal Water Availability in Mimulus

LiT：酸浆草生活史适应季节性水供应变化的基因组分析

• 批准号: 1024966
• 负责人: John Willis
• 金额: $ 58.5万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1024966&HistoricalAwards=false
• 关键词: LiT; Genomic; Analysis; Life; History

John H.Willis IOS - 1024966LiT: Genomic analysis of life-history adaptation to variation in seasonal water availability in MimulusGlobal warming trends indicate that many geographic regions are experiencing shorter, milder winters and longer, hotter summers. Due to the accelerated onset of summer drought in western North America, local plant species reliant on snowmelt and ephemeral water supplies will experience strong selection to grow and reproduce earlier. The evolutionary response of plant species to continued changes in seasonal soil moisture availability will likely involve earlier flowering and flowering under shorter day lengths in order to escape periods of prolonged drought. Tremendous genetic variation in day length sensitivity and flowering time was recently discovered in the ecological genomic model system Mimulus guttatus and its closely related wildflower species. This adaptive variation is associated with local environmental differences in the onset of drought, and it likely represents the kinds of genetic changes that could occur in response to continued climate change. This project uses powerful genome mapping approaches and experiments in natural habitats to identify key genes involved in variation in seasonal timing of flowering and drought escape. The investigators will engage high school and undergraduate students from underrepresented groups in workshops and research projects. Additionally, valuable collections of seed stocks and genome data will be made available to the entire scientific community. The seed collections will be available for evolutionary studies for up to fifty years from now. This will allow them to be compared to future samples from the same populations and to identify genes involved in future climate change adaptations.

全球变暖趋势表明，许多地理区域正在经历更短、更温和的冬季和更长的、更热的夏季。由于北美西部夏季干旱的加速发生，依赖融雪和短暂水供应的当地植物物种将经历强烈的选择，以更早地生长和繁殖。植物物种对季节性土壤水分有效性持续变化的进化反应可能包括开花时间提前和开花时间缩短，以逃避长期干旱期。近年来，在杜鹃（Mimulus guttatus）及其近缘种野生植物的生态基因组模型系统中发现了巨大的日长敏感性和开花时间遗传变异。这种适应性变异与干旱发生时当地环境的差异有关，它很可能代表了为应对持续的气候变化而可能发生的遗传变化。该项目利用强大的基因组图谱方法和在自然栖息地进行的实验来确定与开花和干旱季节变化有关的关键基因。调查人员将邀请来自代表性不足群体的高中生和本科生参加研讨会和研究项目。此外，将向整个科学界提供宝贵的种子库存和基因组数据。从现在起，这些种子收藏将可用于长达50年的进化研究。这将使它们能够与来自同一种群的未来样本进行比较，并确定与未来气候变化适应有关的基因。