Duvall M R, Morton B R
Department of Biology and Microbiology, South Dakota University, Brookings 57007-0595, USA.
Mol Phylogenet Evol. 1996 Apr;5(2):352-8. doi: 10.1006/mpev.1996.0030.
Phylogenetic analyses of rbcL sequence data from grasses are presented, extending the work of an earlier study. Based on molecular evidence that Joinvilleaceae and Restionaceae are closely allied to Poaceae, species from these families and from a distantly related dicot were variously employed as outgroups and analyzed with 23 species of Poaceae using the parsimony method. Measures of support were determined. The terminal portion of the tree was invariant in all analyses. Outgroup selection affected the basal topology of the tree with somewhat different measures of support for the deeper branches of the tree. When the outgroup was the dicot, pooid grasses made up the basal clade. When the outgroup was Joinvilleaceae or Restionaceae, species of Bambusoideae were basalmost. Increased sampling did not result in a marked increase in support of the rbcL data for the earliest branching events.
本文展示了对禾本科植物rbcL序列数据的系统发育分析，扩展了早期一项研究的工作。基于分子证据表明帚灯草科和刺鳞草科与禾本科密切相关，这些科的物种以及一种远缘相关的双子叶植物被不同地用作外类群，并使用简约法与23种禾本科植物进行分析。确定了支持度的度量。在所有分析中，树的末端部分是不变的。外类群的选择影响了树的基部拓扑结构，对树的较深分支有不同程度的支持。当外类群是双子叶植物时，早熟禾亚科禾本科植物构成基部类群。当外类群是帚灯草科或刺鳞草科时，竹亚科的物种是最基部的。增加抽样并没有导致对rbcL数据支持最早分支事件的显著增加。
