PDF(Pubmed)
Abstract：
The genus Euphorbia (Euphorbiaceae) has near-cosmopolitan distribution and serves as a significant resource for both ornamental and medicinal purposes. Despite its economic importance, Euphorbia\'s taxonomy has long been challenged by the intricate nature of morphological traits exhibiting high levels of convergence. While molecular markers are essential for phylogenetic studies, their availability for Euphorbia has been limited. To address this gap, we conducted comparative analyses focusing on the chloroplast (CP) genomes of nine Euphorbia species, incorporating three newly sequenced and annotated accessions. In addition, phylogenetic informativeness and nucleotide diversity were computed to identify candidate markers for phylogenetic analyses among closely related taxa in the genus. Our investigation revealed relatively conserved sizes and structures of CP genomes across the studied species, with notable interspecific variations observed primarily in non-coding regions and IR/SC borders. By leveraging phylogenetic informativeness and nucleotide diversity, we identified rpoB gene as the optimal candidate for species delimitation and shallow-level phylogenetic inference within the genus. Through this comprehensive analysis of CP genomes across multiple taxa, our study sheds light on the evolutionary dynamics and taxonomic intricacies of Euphorbia, offering valuable insights into its CP genome evolution and taxonomy.
摘要：
大猩猩属（Euphorbiaceae）具有近世界性的分布，是观赏和药用的重要资源。尽管其经济重要性,长期以来，一品红的分类学一直受到表现出高度收敛性的形态特征的复杂性质的挑战。虽然分子标记对于系统发育研究是必不可少的，它们对一品红的供应是有限的。为了解决这个差距，我们对9种一品红的叶绿体（CP）基因组进行了比较分析，纳入三个新测序和注释的种质。此外,计算了系统发育信息和核苷酸多样性，以确定该属中密切相关的分类群之间进行系统发育分析的候选标记。我们的调查显示，在所研究的物种中，CP基因组的大小和结构相对保守，主要在非编码区和IR/SC边界观察到显著的种间变异。通过利用系统发育信息和核苷酸多样性，我们确定rpoB基因是该属内物种划界和浅层系统发育推断的最佳候选基因。通过对跨多个分类单元的CP基因组的综合分析，我们的研究揭示了一品红的进化动态和分类复杂性，为其CP基因组进化和分类学提供有价值的见解。
