Dissertation Research: Genetics and the Evolution of Androdioecy in Datisca

论文研究：Datisca 中雄性雌花异株的遗传学和进化

• 批准号: 9902345
• 负责人: Loren Rieseberg
• 金额: $ 0.94万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902345&HistoricalAwards=false
• 关键词: Dissertation; Research; Genetics; Evolution; Androdioecy

9902345Rieseberg Androdioecy is a breeding system in which breeding populations consist of separate male and hermaphrodite individuals, while dioecious populations contain male individuals and female individuals. Theory and phylogenetics suggest that androdioecy is derived from dioecy in Datisca. Furthermore, floral morphology suggests that hermaphrodites are modified females, while males have an ancestral form. The overall goal of this research is to understand the evolution of androdioecy from dioecy. Crosses and molecular markers will be used to investigate the genetic basis of sex determination in the androdioecious plant, Datisca glomerata and its dioecious sister-species, D. cannabina. Furthermore, a search for sex ratio distorters will be made in natural populations of dioecious D. cannabina to test the possibility that female-biased sex ratios were involved in the evolution of androdioecy.Breeding-system evolution is one of the most tractable and best-studied evolutionary processes in plants. Thus it provides an excellent model for evolution as a whole. Furthermore, because most breeding system theory was developed for other breeding systems, androdioecy provides an independent test of the rules thought to control breeding system evolution. These studies will help explain the genetic processes allowing androdioecy to evolve through natural selection in Datisca. More broadly, they will illuminate the role of genetics in breeding-system evolution and in adaptive evolution as a whole.

9902345Rieseberg雄株异株生殖系统是一种繁殖系统，其中繁殖种群由单独的雄性和雌雄同体个体组成，而雌雄异株种群包含雄性个体和雌性个体。 理论和遗传学研究表明，雄二萜是从Datisca的二萜衍生而来的。 此外，花的形态学表明，雌雄同体的修改女性，而男性有一个祖先的形式。 本研究的总体目标是了解雄甾体从甾体的进化。 本研究拟利用杂交和分子标记技术，探讨雌雄异株植物鸭茅及其雌雄异株姊妹种鸭茅性别决定的遗传基础。大麻 此外，还将在雌雄异株的D. cannabina来检验雌性偏向的性比参与雄二萜类进化的可能性。繁殖系统进化是植物中最易处理和研究最多的进化过程之一。 因此，它为整个进化提供了一个极好的模型。 此外，由于大多数育种系统理论是为其他育种系统而开发的，因此雄配子体提供了一个独立的规则测试，这些规则被认为是控制育种系统进化的。这些研究将有助于解释在Datisca中通过自然选择使雄甾烯进化的遗传过程。 更广泛地说，他们将阐明遗传学在育种系统进化和整个适应性进化中的作用。