Dissertation Research: The evolution of reproductive isolation across the genus Mimulus

论文研究：酸浆属生殖隔离的进化

• 批准号: 0808447
• 负责人: Douglas Schemske
• 金额: $ 1.2万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0808447&HistoricalAwards=false
• 关键词: Dissertation; Research; evolution; reproductive; isolation

The stunning biodiversity found on Earth ultimately arose through the fundamental process of speciation. While biologists have long been fascinated by species origination, there are many important unanswered questions. Among these, a central question to speciation research is what kinds of barriers most commonly drive the process, and particular debate has surrounded the relative importance of pre- versus postzygotic barriers. Prezygotic barriers are those that limit hybrid formation, while postzygotic barriers involve reduced hybrid fitness. The proposed study will examine the strength of multiple forms of reproductive isolation in ten recently diverged species pairs in the genus Mimulus (monkeyflowers). A variety of field, greenhouse, and laboratory methods will be employed to examine prezygotic barriers including differences in habitat, timing of reproduction, pollinators, and gametic compatibility. Postzygotic barriers will be assessed by performing experimental hybridizations in the laboratory and greenhouse. Additionally, patterns of current and historical gene flow will be examined and compared to measures of current isolation. This project will also serve to train undergraduates, including individuals from underrepresented groups. In addition, the results of this study will be used to enhance secondary school teaching in the local school district.

地球上令人惊叹的生物多样性最终是通过物种形成的基本过程产生的。虽然生物学家长期以来一直对物种起源着迷，但仍有许多重要的问题没有得到解答。其中，物种形成研究的一个中心问题是什么样的障碍最常见的驱动程序，特别是围绕前与后合子障碍的相对重要性的争论。前合子障碍是指限制杂种形成的障碍，而后合子障碍则是指杂种适合度降低。这项拟议的研究将研究Mimulus（猴花）属10个最近分化的物种对中多种形式的生殖隔离的强度。将采用各种田间、温室和实验室方法来检查受精前障碍，包括栖息地、繁殖时间、传粉者和配子相容性的差异。将通过在实验室和温室中进行实验性杂交来评估合子后障碍。此外，将检查当前和历史基因流的模式，并将其与当前隔离的措施进行比较。该项目还将培训本科生，包括来自代表性不足群体的个人。此外，这项研究的结果将用于加强当地学区的中学教学。