DISSERTATION RESEARCH: Interrelationships Among Perianth Size, Inbreeding, and Divergence in the Plant Boerhavia (Nyctaginaceae)

论文研究：布尔哈维亚植物（紫夜蛾科）花被大小、近交和分化之间的相互关系

• 批准号: 0309276
• 负责人: Paul Manos
• 金额: $ 1.02万
• 依托单位: Duke University
• 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: 2003-06-15 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0309276&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Interrelationships; Among; Perianth

This research concerns a group of approximately 22 plant species that has diversified in the Sonoran and Chihuahuan Deserts, the genus Boerhavia. Species of Boerhavia can self-pollinate, and also have very different flower sizes, which affects how often insects visit and transfer pollen between plants. This project tests whether species with smaller flowers have a greater amount of genetic differentiation between populations that are highly inbred, because pollen can not frequently flow between populations. Genetic fingerprinting techniques will establish the proportion of seeds on a plant that are sired by other individuals. This will be done for many individuals per population, for all North American species. The same data will also provide estimates of the differences between populations, and their level of inbreeding. Combining this data with the evolutionary history of Boerhavia, it will be possible to test whether species with smaller flowers exhibit populations diverging into genetically distinct species.This project will provide training for N. Douglas in botany and population biology. Mexican botanists are collaborating in this research. The project will estimate the total genetic diversity of four extremely rare, unprotected species in the U.S. and Mexico. Thus, it will find an audience among botanists, ecologists, and conservationists in both nations.

这项研究涉及大约 22 种在索诺兰和奇瓦瓦沙漠中多样化的植物物种，即布尔哈维亚属 (Boerhavia)。 布尔哈维亚物种可以自花授粉，并且花朵大小也有很大差异，这会影响昆虫访问植物和在植物之间转移花粉的频率。 该项目测试花朵较小的物种在高度近交的种群之间是否具有更大的遗传分化，因为花粉不能频繁地在种群之间流动。 基因指纹技术将确定植物上由其他个体产生的种子的比例。 这将对每个种群中的许多个体、所有北美物种进行。 相同的数据还将提供对种群之间差异及其近亲繁殖水平的估计。 将这些数据与布尔哈维亚的进化历史相结合，将有可能测试花朵较小的物种是否表现出种群分化为遗传上不同的物种。该项目将为 N. Douglas 提供植物学和种群生物学方面的培训。 墨西哥植物学家正在合作进行这项研究。 该项目将估算美国和墨西哥四种极其稀有、未受保护物种的总遗传多样性。 因此，它将在两国的植物学家、生态学家和自然资源保护主义者中找到读者。