CRB: Pollen Mediated Genetic Rescue in Plant Metapopulations

CRB：花粉介导的植物复合种群遗传拯救

• 批准号: 9610496
• 负责人: David McCauley
• 金额: $ 20.8万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9610496&HistoricalAwards=false
• 关键词: CRB; Pollen; Mediated; Genetic; Rescue

9610496 McCauley This project will use the plant Silene alba as a model system to investigate how genetic factors influence the persistence of populations. Many species are distributed into numerous small local populations owing to the natural distribution of patches of favorable habitat, or due to human impact on the landscape. Small populations often face a high probability of extinction, and the persistence of the species at large may require that new populations be founded at a rate that offsets local extinctions. Since small or recently established populations often display the harmful effects of inbreeding, it is important to understand the genetic characteristics of newly formed populations. This study will ask whether recently established populations are prone to the harmful effects of inbreeding such that inbreeding influences population persistence. It will also ask whether the movement of genes from population to population by pollen dispersal (gene flow) can offset the effects of inbreeding. Studies of both natural and experimental populations of S. alba will address these issues. Studies of natural populations will use genetic techniques to measure the rate at which new genes enter recently founded populations owing to pollen movement. They will also investigate whether plants formed by this gene flow are more vigorous than their neighbors. In other experiments artificial populations of S. alba will be created in order to investigate the interaction of gene flow by pollen and inbreeding under more controlled conditions. Taken together, the results of these studies should contribute to a more general understanding of how genetic and ecological factors interact to determine the probability that a species can persist in a given landscape.

9610496 McCauley本项目将使用植物白硅作为模型系统来研究遗传因素如何影响种群的持久性。由于有利生境的自然分布，或由于人类对景观的影响，许多物种分布成许多小的地方种群。小种群往往面临灭绝的高可能性，而物种的普遍存在可能需要以抵消局部灭绝的速度建立新种群。由于小种群或新近建立的种群经常表现出近亲繁殖的有害影响，因此了解新形成种群的遗传特征是很重要的。这项研究将询问最近建立的种群是否容易受到近亲繁殖的有害影响，即近亲繁殖是否会影响种群的持久性。它还将询问通过花粉传播（基因流）在种群之间的基因移动是否可以抵消近亲繁殖的影响。对自然种群和实验种群的研究将解决这些问题。对自然种群的研究将使用遗传技术来测量由于花粉运动而进入新种群的新基因的速率。他们还将调查由这种基因流形成的植物是否比它们的邻居更有活力。在其他实验中，为了在更严格的控制条件下研究花粉基因流和近交的相互作用，将创建白孢粉的人工种群。综上所述，这些研究的结果应该有助于更全面地了解遗传和生态因素如何相互作用，以决定一个物种在给定景观中持续存在的可能性。