A Nested Phylogenetic Analysis of Malvales, Bombacaceae and Adansonieae

9419997鲍姆马尔瓦勒植物目包含约5,000种主要是热带植物，其中包括几种具有重要经济价值的植物(棉花、巧克力、秋葵、木槿花)。哈佛大学的David Baum博士和他的同事William Alverson博士的这项研究将利用分子技术和植物形态分析来研究该目的进化，特别是在三个嵌套水平上某些群体的系统发育。重点放在开花植物的主要双子叶辐射中的Malvales目；Bombacaceae科(木棉科)在该目中的位置；以及Bombacaceae部落和属之间的关系，这是三个层面的重点。分子研究将涉及到Bombacaceae和相关的Malvaceae、Tiliaceae和Sterculiaceae的代表性物种的DNA序列的测定，重点是几个叶绿体基因。同时，还将研究Bombacaceae属和其他三个科的近缘属的形态特征，并将使用组合数据集来推断分类群之间的系统发育关系。由此产生的系统发育框架可以用来解释Bombacaceae内花型的巨大多样性，并解释染色体数量的进化变化和随时间的地理迁移。?？

9419997 Baum The plant order Malvales contains ca. 5000 species of mainly tropical plants including several of economic importance (cotton, chocolate, okra, hibiscus). This study by Dr. David Baum of Harvard University and his colleague Dr. William Alverson will employ molecular techniques and analyses of plant morphology to study the evolution of the order, and in particular the phylogeny of certain groups at three nested levels. The placement of the order Malvales within the major dicot radiation of flowering plants; the placement of the family Bombacaceae (the kapok family) within the order; and relationships among the tribes and genera of Bombacaceae, are the three levels of emphasis. The molecular studies will involve the determination of DNA sequences from representative species of Bombacaceae and related Malvaceae, Tiliaceae, and Sterculiaceae, with emphasis on several chloroplast genes. In parallel the genera of Bombacaceae and relatives in the other three families will be studied for morphological characteristics, and the combined datasets will be used to infer phylogenetic relationships among the taxa. The resulting phylogenetic framework can be used to explain the great diversity of floral form within Bombacaceae and to account for evolutionary shifts in chromosome number and for geographical migrations through time. ??