A duplicate gene rooting of seed plants and the phylogenetic position of flowering plants
A duplicate gene rooting of seed plants and the phylogenetic position of flowering plants
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DOI：
10.1098/rstb.2009.0233
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发表时间：
2010-02-12
影响因子：
6.3
通讯作者：
Beilstein, Mark A.
中科院分区：
文献类型：
--
作者：
Mathews, Sarah;Clements, Mark D.;Beilstein, Mark A.
就现存物种的数量、对现代生态系统形成的影响和经济重要性而言，开花植物代表了陆地植物树中最重要的分支。然而，与从DNA序列数据中获得见解的许多持久的系统发育问题不同，围绕被子植物起源的神秘面纱随着分子系统学的出现和发展而加深。强有力的统计支持竞争性假设和最近来自分子数据的新树表明，当前分子树的准确性需要进一步测试。利用重复基因生根方法对光敏色素氨基酸进行分析，结果表明苏铁和被子植物在一个分支中是姊妹分支，其中银杏和柏树是遗传植物和松科的连续姊妹分类群。在形态学数据集分析中，应用苏铁+被子植物的主干约束产生比现有裸子植物被迫为单系的分析更好的树。结果对我们从序列数据中评估树的不确定性以及我们使用分子约束作为整合形态学和分子证据的见解的方法都有影响。
Flowering plants represent the most significant branch in the tree of land plants, with respect to the number of extant species, their impact on the shaping of modern ecosystems and their economic importance. However, unlike so many persistent phylogenetic problems that have yielded to insights from DNA sequence data, the mystery surrounding the origin of angiosperms has deepened with the advent and advance of molecular systematics. Strong statistical support for competing hypotheses and recent novel trees from molecular data suggest that the accuracy of current molecular trees requires further testing. Analyses of phytochrome amino acids using a duplicate gene-rooting approach yield trees that unite cycads and angiosperms in a clade that is sister to a clade in which Gingko and Cupressophyta are successive sister taxa to gnetophytes plus Pinaceae. Application of a cycads + angiosperms backbone constraint in analyses of a morphological dataset yields better resolved trees than do analyses in which extant gymnosperms are forced to be monophyletic. The results have implications both for our assessment of uncertainty in trees from sequence data and for our use of molecular constraints as a way to integrate insights from morphological and molecular evidence.