DISSERTATION RESEARCH: Genetic and Ecophysiological Causes of Differential Fitness in a Natural Plant Hybrid Zone

论文研究：天然植物杂交区适应性差异的遗传和生态生理学原因

• 批准号: 0308772
• 负责人: Diane Campbell
• 金额: $ 1.2万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-06-01 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0308772&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Genetic; Ecophysiological; Causes

Natural hybridization is an important process in the evolution of many plant species. Determining how selection acts against different hybrid genotypes is necessary for understanding the likelihood of different outcomes of hybridization. This study uses a model natural hybrid system between Ipomopsis aggregata and I. tenuituba to examine potential causes of fitness differences among hybrids, and thus what processes are important in limiting and promoting hybridization. Using field and greenhouse experiments, this study examines: (1) the distribution of nuclear and cytoplasmic genotypes in a natural hybrid population; (2) the influence of nuclear and cytonuclear interactions on fitness of hybrid genotypes, and if these interactions are environment-dependent; (3) ecophysiological variation among hybrid and parental genotypes that may affect relative performance across environmental conditions in a hybrid zone. This work uses an integrated approach that examines both genetic and ecological factors that may influence the outcome of natural hybridization. Understanding how these factors affect differential hybrid fitness is necessary for understanding the evolutionary consequences of hybridization, and ultimately gene flow between species. Such information about hybrid zone dynamics has broad implications for evaluating the potential impacts of hybridization between native and exotic or genetically modified species.

自然杂交是许多植物物种进化的重要过程。 确定选择如何针对不同的杂交基因型起作用对于了解杂交不同结果的可能性是必要的。本研究使用 Ipomopsis aggregata 和 I. tenuituba 之间的模型自然杂交系统来检查杂交体之间适应性差异的潜在原因，从而研究哪些过程对于限制和促进杂交很重要。通过田间和温室实验，本研究检查：（1）自然杂交种群中核和细胞质基因型的分布； (2) 核和细胞核相互作用对杂交基因型适应性的影响，以及这些相互作用是否依赖于环境； (3) 杂交种和亲本基因型之间的生态生理变化可能影响杂交区环境条件下的相对性能。 这项工作采用综合方法来检查可能影响自然杂交结果的遗传和生态因素。 了解这些因素如何影响差异杂交适应性对于理解杂交的进化后果以及最终物种之间的基因流动是必要的。 有关杂交区动态的此类信息对于评估本地和外来或转基因物种之间杂交的潜在影响具有广泛的意义。