Data from: Testing for phylogenetic conflict among molecular data sets in the Tribe Triticeae (Gramineae)

Four molecular data sets are available for the diploid intersterile genera of the cereal grain tribe Triticeae, and there are numerous differences among the four published trees. All six pairwise combinations of data sets were examined using tree comparisons, the incongruence length difference test, the Wilcoxon signed ranks test, and a permutation test. We describe some advantages, disadvantages, and properties of the different comparison methods. Test results provide no evidence for significant differences in the phylogenetic signal among the three nuclear data sets, with the exception of the placement of a single taxon. The chloroplast DNA restriction site data, however, support a significantly different tree, and the differences probably reflect a separate evolutionary history of the chloroplast genome.

针对禾谷类族（Triticeae）中属间互不育的二倍体属类群，现有四套分子数据集，且已发表的四棵系统发育树间存在诸多差异。本研究针对全部六种数据集两两组合，采用树结构比较法、不一致长度差异检验(incongruence length difference test)、威尔科克森符号秩检验(Wilcoxon signed ranks test)与置换检验(permutation test)开展了分析。本文阐述了各类比较方法的优势、局限与特性。检测结果表明，除单个类群的系统发育位置存在差异外，三套核数据集(nuclear data sets)的系统发育信号(phylogenetic signal)无显著差异。然而，叶绿体DNA限制性酶切位点数据所支持的系统发育树则存在显著差异，该差异或反映了叶绿体基因组独立的演化历程。