Becerra Judith X
Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721, USA.
Mol Phylogenet Evol. 2003 Feb;26(2):300-9. doi: 10.1016/s1055-7903(02)00256-7.
I reconstructed a phylogeny of 66 species and varieties of Bursera and 9 outgroup species using sequences of the internal transcribed spacer region (ITS), the 5S non-transcribed region (5S-NTS), and the external transcribed region (ETS) of nuclear ribosomal DNA. This study extends a previously proposed parsimony-based phylogenetic study that used the ITS sequences of 57 Bursera species and five outgroups. Parsimony and maximum likelihood methods were used to infer the phylogeny in this new study. Analyses of the combined data sets largely confirmed the phylogenetic relationships proposed by the previous molecular study but generated a considerably more robust topology. The new phylogenies corroborate the monophyly of the genus, and its division into the two monophyletic subgenera or sections, Bursera and Bullockia. The current analyses also identify four main groups of species in section Bursera, and two in section Bullockia, confirming some of the previously proposed groups based on fruit, flower, and leaf morphology. One previously problematic species B. sarcopoda, which has sometimes been placed in Commiphora, is shown to belong in Bursera. Another controversial species, Commiphora leptophloeos, which was thought to belong to Bursera, falls within Commiphora.
我利用核糖体DNA的内部转录间隔区（ITS）、5S非转录区（5S-NTS）和外部转录区（ETS）序列，重建了66种裂榄属物种和变种以及9个外类群物种的系统发育树。本研究扩展了先前一项基于简约法的系统发育研究，该研究使用了57种裂榄属物种和5个外类群的ITS序列。在这项新研究中，使用简约法和最大似然法来推断系统发育。对合并数据集的分析在很大程度上证实了先前分子研究提出的系统发育关系，但产生了一个更为稳健的拓扑结构。新的系统发育树证实了该属的单系性，及其分为两个单系亚属或组，即裂榄组和布洛克榄组。当前的分析还确定了裂榄组中的四个主要物种群，以及布洛克榄组中的两个物种群，证实了一些先前基于果实、花和叶形态提出的类群。一个先前存在问题的物种——有时被归入没药属的肉托裂榄，被证明属于裂榄属。另一个有争议的物种，曾被认为属于裂榄属的细叶没药，属于没药属。
