Evolution of Annuals Under Resource Modification: Genetic Diversity and Trait Evolution Under Interacting Components of Global Change (CO2, Temperature, and Nitrogen)

全球环境变化给植物带来了复杂的挑战。尽管在现存植物的一生中会发生一些变化，但对这些变化的反应将在很大程度上取决于种群的行为。在不断变化的世界中，植物种群将如何进化？全球变化将如何改变当前的进化过程？第一个重点将放在全球变化可能产生的直接选择性影响上。pi将测量一种名为Abutilon theophrastii的杂草在升高的二氧化碳和温度条件下的选择压力变化。然后，pi将使8代人经受这些新的选择压力，以阐明对全球变化的进化反应。其次，这些条件可能会改变植物对目前在植物环境中发现的选择压力的反应。新的条件可能会改变性状之间的发育整合，揭示对选择反应的遗传潜力。性状间相关性质的这些潜在变化可能通过削弱性状间的权衡和潜在地暴露性状间新的相关性来改变植物群体对选择压力的反应。通过对8代特定性状施加选择，研究CO2浓度升高对选择响应的影响。这些实验将揭示在全球变化下植物种群将如何变化。

Bazzaz 9615298 Global environmental changes pose complex challenges for plants. Although some changes will occur within the lifetime of extant plants, the response to these changes will depend strongly on how populations behave. How will plant populations evolve in a change world? How will global changes alter current evolutionary process? The first focus will be on the direct selective effects global change may exert. The PIs will measure changes in selective pressures in elevated CO2 and temperature conditions in a weed, Abutilon theophrastii. The PIs will then subject 8 generations to these new selective pressures to elucidate evolutionary response to global change. Secondly, these conditions may alter response to selective pressures currently found in the plant environment. Novel conditions are likely to alter the developmental integration among traits, uncovering genetic potential for response to selection. These potential changes in the nature of correlations among traits may alter the response of plant populations to selective pressures, both by weakening tradeoffs among traits and by potentially exposing new correlation among traits. The effects of elevated CO2 levels on the response to selection will be investigated by imposing selection for particular traits in 8 generations. These experiments will suggest how plant populations will change under global change.