Collaborative Research: The Evolution of Heterostylous Breeding Systems in Populations of Oxalis Alpina in the Sky Islands of the United States and Mexico

合作研究：美国和墨西哥天空群岛高山酢浆草种群异柱育种系统的进化

• 批准号: 0614208
• 负责人: Travis Glenn
• 金额: --
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-10-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0614208&HistoricalAwards=false
• 关键词: Collaborative; Research; Evolution; Heterostylous; Breeding

Breeding systems determine how individuals get together to reproduce, and influence the amount of genetic diversity in populations and the potential for speciation. Plants provide model systems for understanding factors promoting changes in breeding systems because of their variability in reproductive systems. In heterostyly, distinctive floral forms are associated with chemical incompatibilities that usually prevent mating between similar forms and promote crossing between forms (outcrossing). Oxalis alpina appears to be evolving a new breeding system, with loss of one floral morph in some populations. To test previous models indicating that changes in self-incompatibility are responsible for breeding system evolution, crosses will be carried out to determine whether changes in incompatibility are more common in populations where heterostyly is more highly modified. Outcrossing rates will be measured because greater self-compatibility could retard loss of morphs. The relative fitness of offspring from crosses within and between different morphs will be measured to understand the importance of inbreeding depression in this breeding system change. Research will focus on populations of Oxalis alpina occurring in mountain ranges extending through Mexico, Arizona, and New Mexico.This research provides insights into evolutionary factors that underlie modifications of plant breeding systems, and reproductive systems in general. The research fosters an international collaboration, with participation of faculty, graduate students, and undergraduates from U.S. and Mexican institutions. This project is being supported by the Office of International Science and Engineering.

育种系统决定了个体如何聚在一起繁殖，并影响人群中遗传多样性的数量和物种物种的潜力。植物提供了模型系统，以了解促进育种系统变化的因素，因为它们在生殖系统中的可变性。在异质的情况下，独特的花卉形式与化学不相容性有关，这些化学不兼容通常阻止相似形式之间交配并促进形式之间的跨越（脱落）。草酸藻似乎正在发展出一种新的育种系统，在某些人群中，一种花朵变形的损失。为了测试以前的模型，表明自我兼容性的变化是导致繁殖系统演变的原因，将进行十字架，以确定不兼容的变化是否更常见，而在异性更高的人群中，不兼容的变化更为普遍。由于更大的自我兼容性可能会阻碍变形的损失，因此将衡量脱落率。将衡量后代和不同形态之间的十字架的相对适应性，以了解这种育种系统变化中近交抑郁症的重要性。研究将重点关注的是在墨西哥，亚利桑那州和新墨西哥州延伸的山脉中发生的草藻种群。这项研究提供了对植物育种系统修改和一般生殖系统的进化因素的见解。这项研究促进了国际合作，由美国和墨西哥机构的教职员工，研究生和本科生的参与。该项目得到了国际科学与工程办公室的支持。