Phylogeny of Saxifragaceae and Relationships in Rosales Using rbcL Sequence Analysis

使用 rbcL 序列分析研究虎耳草科的系统发育和蔷薇科植物的亲缘关系

• 批准号: 9007614
• 负责人: Douglas Soltis
• 金额: $ 20.02万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-02-01 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9007614&HistoricalAwards=false
• 关键词: Phylogeny; Saxifragaceae; Relationships; Rosales; Using

Evolutionary or genealogical relationships in flowering plants are often poorly understood at taxonomic levels above the rank of genus. These difficulties presumably reflect the more frequent occurrence of convergent or parallel evolution in morphological characters at higher taxonomic levels. Although numerous examples of this exist, one of the most problematic is the Saxifragaceae family, including the gooseberries, hydrangeas, and saxifrages. As originally defined, this family consists of a diverse array of herbaceous and woody plants distributed throughout the world and placed into 15-17 subfamilies. Little agreement exists among plant systematists regarding the circumscription, taxonomic rank (subfamily, family), or relationships of these various groups. The taxonomic complexity involved in dealing with the Saxifragaceae also requires a thorough analysis of the large order Rosales, of which it is a member. It has become clear in recent years that DNA sequence comparisons can be particularly helpful in determining evolutionary relationships at higher taxonomic levels. Dr. Douglas Soltis of Washington State University is studying nucleotide sequence variation among a large sample of species of Saxifragaceae, focusing upon the photosynthesis-related gene rbcL. A broad analysis of rbcL sequence data will help clarify relationships within Saxifragaceae and in conjunction with data being generated in several other laboratories will contribute to determination of phylogenetic affinities among the rosalean dicots. The resulting phylogeny will then provide an evolutionary framework for interpreting change in morphological and chemical characteristics of these plants, and for informing their historical biogeography.

开花的进化或系谱关系 植物通常在分类学水平上知之甚少， 属的等级。 这些困难大概反映了 经常发生趋同或平行进化， 在较高的分类学水平上的形态特征。 虽然 这方面的例子有很多，其中最有问题的是 虎耳草科，包括醋栗，绣球花， 和虎耳草 根据最初的定义，该族由 各种各样的草本和木本植物分布在 分布在世界各地，分为15-17个亚科。 小 植物系统学家之间存在着关于 界限，分类等级（亚科，科），或 这些不同群体的关系。 分类的复杂性 参与处理虎耳草科也需要一个 深入分析了大订单罗萨莱斯，其中它是一个 会员是否 近年来，人们已经清楚地认识到，DNA序列 比较可以特别有助于确定 在更高的分类学水平上的进化关系。 博士 华盛顿州立大学的道格拉斯·索蒂斯正在研究 在大样本的物种之间的核苷酸序列变异 虎耳草科植物光合作用相关基因的研究 rbcL。 对rbcL序列数据的广泛分析将有助于阐明 虎耳草科内的关系和数据 在其他几个实验室产生的， 罗莎莉亚群亲缘关系的测定 双子叶植物。 由此产生的遗传学将提供一个 解释形态变化的进化框架 这些植物的化学特性，并告知 他们的历史传记