Dissertation Research: Molecular Systematics and Chloroplast Genome Evolution of Convolvulaceae

论文研究：旋花科分子系统学和叶绿体基因组进化

• 批准号: 0073396
• 负责人: Richard Olmstead
• 金额: $ 1万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-15 至 2003-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0073396&HistoricalAwards=false
• 关键词: Dissertation; Research; Molecular; Systematics; Chloroplast

0073396OlmsteadConvolvulaceae, the Morning-glory Family, with some 1600-1700 species are a large group of flowering plants. The members of this family present a rich diversity of morphological characteristics and ecological habitats. Although the family is best known in temperate regions by its weedy representatives (e.g., binding weed) many tropical species are valuable ornamentals and sources of hallucinogenic drugs and purgatives. The "sweet potato" is the World's second most important root crop ( 128 M metric tones per year). Furthermore, many species are used as experimental model organisms in evolutionary and molecular genetics studies (e.g., comparative study of pollination syndromes, research on resistance and tolerance to herbivory and pathogens, biochemical pathways research).Despite this interest, little is certain about the historical relationships among members of the Convolvulaceae. Large plant groups present challenges to systematists interested in understanding the evolution of these groups. Molecular data from chloroplast and nuclear DNA sequences, supplemented with floral and vegetative morphological data, will be used to obtain accurate reconstruction of the relationships within this family. Once resolved, the inferred relationships will be used for following purposes: 1) to assist investigators who seek a historical context for the appearance of particular significant traits among these plants; 2) to analyze the agreement between DNA data and morphological data, with the aim of obtaining a natural classification for this family based on both kinds of information; and 3) to test a series of hypotheses on molecular processes of chloroplast genome evolution in this family, one of the few flowering plant families exhibiting substantial chloroplast genome rearrangements. This investigation will complement other studies being performed in closely related families and will impact the fields of molecular evolution, population genetics, taxonomy, and systematics.

0073396牵牛花科（英语：OlmsteadConvolvulaceae），牵牛花科（英语：Morning-glory Family），约有1600-1700种，是一大类开花植物。该科的成员呈现出丰富多样的形态特征和生态栖息地。虽然该科在温带地区以其杂草代表（例如，许多热带物种是有价值的麻醉剂，也是致幻药物和泻药的来源。甘薯是世界上第二大块根作物（每年1.28亿公吨）。此外，许多物种被用作进化和分子遗传学研究中的实验模式生物（例如，授粉综合征的比较研究，对草食动物和病原体的抗性和耐受性的研究，生物化学途径的研究）。尽管有这种兴趣，但对旋花科成员之间的历史关系知之甚少。大型植物类群对系统分类学家提出了挑战，他们有兴趣了解这些类群的进化。从叶绿体和核DNA序列的分子数据，辅以花和营养形态数据，将被用来获得准确的重建这个家庭内的关系。一旦解决，推断的关系将用于以下目的：1）帮助研究人员寻找这些植物中出现的特定重要性状的历史背景; 2）分析DNA数据和形态数据之间的一致性，目的是基于这两种信息获得该科的自然分类;和3）测试一系列关于该科叶绿体基因组进化的分子过程的假设，该科是少数几个表现出大量叶绿体基因组重排的开花植物科之一。这项调查将补充其他研究正在密切相关的家庭，并将影响分子进化，群体遗传学，分类学和系统学领域。