Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721.
Am J Bot. 1999 Jul;86(7):1047-57.
The genus Bursera (Burseraceae) is one of the most diversified and abundant groups of plants of the tropical dry forests of Mexico. In order to provide a basis for better understanding of its evolutionary biology, we reconstructed a phylogeny of 57 species and varieties using the nucleotide sequences of the internal transcribed spacer regions (ITS1 and ITS2) of 18S-26S and the 5.8S coding region of nuclear ribosomal DNA. We used four species of the allied genera Commiphora and Boswellia and one species of Spondias (Anacardiaceae) as outgroups. Our results support the views that Bursera is monophyletic and more closely related to Commiphora than to Boswellia. The division of Bursera into sections Bullockia and Bursera is also strongly supported by our phylogeny. Several other subclades also had high bootstrap values, especially within section Bursera. We use the phylogeny as a basis for discussing evolutionary tendencies in bark, leaves, breeding systems, and fruits.
该属植物（Burseraceae）是墨西哥热带干旱森林中最具多样性和丰富度的植物群之一。为了更好地理解其进化生物学，我们使用核核糖体 DNA 的 18S-26S 和 5.8S 编码区的内部转录间隔区（ITS1 和 ITS2）的核苷酸序列，对 57 个物种和变种进行了系统发育重建。我们使用了四个相关属的 Commiphora 和 Boswellia 物种以及 Spondias（漆树科）的一个物种作为外群。我们的结果支持以下观点：Bursera 是单系的，与 Commiphora 的关系比与 Boswellia 的关系更密切。Bursera 分为 Bullockia 和 Bursera 两个部分，这也得到了我们的系统发育树的强烈支持。其他几个亚分支也具有较高的自举值，尤其是在 Bursera 部分内。我们使用系统发育树作为讨论树皮、叶子、繁殖系统和果实进化趋势的基础。
