Collaborative Research: Unravelling the Dynamics of Mating-System Evolution in Tribe Collinsieae (Scrophulariaceae s.l.)

合作研究：揭示 Collinsieae 部落 (Scrophulariaceae s.l.) 交配系统进化的动力学

• 批准号: 0324733
• 负责人: Bruce Baldwin
• 金额: --
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0324733&HistoricalAwards=false
• 关键词: Collaborative; Research; Unravelling; Dynamics; Mating

This study addresses fundamental questions about the evolution of plant mating systems: (1) Why does self-pollination evolve? (2) Is selfing an evolutionary dead-end? (3) Can selfing vs. outbreeding strategies be reliably identified by particular floral features, such as timing of self-pollination? (4) Does evolution of particular mating systems lead to predictable changes in floral characteristics? The investigators will focus on an ideal system for investigating the above questions--the tribe Collinsieae, a diverse group of native, annual herbs that show evidence of repeated evolutionary shifts between selfing and outbreeding strategies. The research will involve field and laboratory studies to resolve precisely the mating systems of populations throughout the tribe, using genetic, developmental, and ecological data, and to reconstruct the dynamic history of mating-system change in the group.Evolution of selfing is of special interest to biologists and geneticists, who have long recognized that it can rapidly cause the loss of genetic variation, expression of deleterious traits, and loss of evolutionary potential. Different (conflicting) hypotheses proposed to explain evolution of selfing strategies have not been adequately tested and the basic question of whether selfing lineages can spawn outbreeding lines with long-term evolutionary prospects remains unanswered. Resolving these issues would greatly advance evolutionary biology and is a primary goal of this investigation.

这项研究解决了有关植物交配系统进化的基本问题：（1）为什么自花授粉会进化？ （2）自交是进化的死胡同吗？ (3) 能否通过特定的花卉特征（例如自花授粉的时间）可靠地识别自交与远交策略？ (4) 特定交配系统的进化是否会导致花特征发生可预测的变化？ 研究人员将重点关注研究上述问题的理想系统——Collinsieae部落，这是一种多样化的本土一年生草本植物，显示出自交和远交策略之间反复进化转变的证据。 该研究将涉及实地和实验室研究，利用遗传、发育和生态数据精确解决整个部落种群的交配系统，并重建群体交配系统变化的动态历史。 自交进化具有特殊性生物学家和遗传学家对此很感兴趣，他们很早就认识到它会迅速导致遗传变异的丧失、有害性状的表达以及进化潜力的丧失。 为解释自交策略进化而提出的不同（相互冲突的）假设尚未得到充分检验，并且自交谱系是否可以产生具有长期进化前景的远交系的基本问题仍未得到解答。 解决这些问题将极大地推进进化生物学的发展，也是本次研究的主要目标。