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首页> 外文期刊>Systematic Botany >A Molecular Phylogeny of the Species-Rich Neotropical Genus Anthurium (Araceae) based on Combined Chloroplast and Nuclear DNA
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A Molecular Phylogeny of the Species-Rich Neotropical Genus Anthurium (Araceae) based on Combined Chloroplast and Nuclear DNA

机译：基于叶绿体和核DNA的物种丰富的新热带红掌（天南星）的分子系统发育

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摘要

Anthurium is a strictly Neotropical genus of Araceae ranging from southern Mexico to northern Argentina, including approximately 900 accepted species names. Despite its immense diversity, its ecological importance in Neotropical forests, and a long history of botanical collection, cultivation, and taxonomical research, Anthurium has been only cursorily sampled in previous molecular phylogenies. This study aims to test the monophyly of Anthurium, to understand the evolutionary history of the genus, and to elucidate relationships among its species using maximum parsimony, maximum likelihood and Bayesian analyses on a combined chloroplast (trnG intron, trnH-psbA and trnC-ycf6 intergenic spacers) and nuclear (CHS first intron and partial flanking coding regions) DNA sequence dataset for 102 Anthurium species and closely related outgroups. Despite some limitations (ca. 11% species richness coverage, and lack of nuclear sequences for outgroups), results indicate that Anthurium is a strongly supported monophyletic genus and that at least 18 major supported clades are recognizable within it, most of them easily characterized morphologically and/or geographically. This study also suggests that the current sectional classification of Anthurium does not accurately represent its evolutionary history since most of the major clades recovered in these analyses do not correspond with the current circumscriptions of infrageneric groups. Despite using the most variable gene regions available, low sequence divergence was found among Anthurium species, relatively short branches characterize the core of the Anthurium clade, and resolution is still lacking in the deeper nodes of the phylogeny, a pattern consistent with a rapid, and probably recent, radiation of species.
机译：红掌是天南星科植物的严格新热带属，范围从墨西哥南部到阿根廷北部，包括大约900个公认的物种名称。尽管红掌具有巨大的多样性，在新热带森林中具有重要的生态意义，而且在植物收集，栽培和分类学研究方面历史悠久，但在以前的分子系统发育中仅粗略地取样了红掌。这项研究旨在测试红掌的单性，了解该属的进化历史，并使用最大简约，最大似然和贝叶斯分析对组合叶绿体（trnG内含子，trnH-psbA和trnC-ycf6 102个红掌物种和密切相关的外群的核基因（CHS第一内含子和部分侧翼编码区）和核DNA序列数据集。尽管有一些局限性（大约11％的物种丰富度覆盖，并且缺少外群体的核序列），结果表明，红掌是一个强有力的单系属，并且在其中至少可以识别18个主要的支持进化枝，其中大多数易于形态学表征和/或地理位置。这项研究还表明，由于在这些分析中发现的大多数主要进化枝都与当前的属下群体的限制不符，因此目前的红掌的分区分类不能准确地代表其进化史。尽管使用了可用的可变性最高的基因区域，但在红掌物种之间发现了低序列差异，相对较短的分支是红掌进化枝核心的特征，而且在系统发育的较深节点仍缺乏分辨率，这种模式与快速一致，并且可能是最近的物种辐射。

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