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首页> 外文期刊>Molecular phylogenetics and evolution >Phylogenetic analysis of Allium subg. Melanocrommyum infers cryptic species and demands a new sectional classification
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Phylogenetic analysis of Allium subg. Melanocrommyum infers cryptic species and demands a new sectional classification

机译：葱亚种的系统发育分析。黑色素细菌推断隐性物种并需要新的分类

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Allium subgenus Melanocrommyum (Alliaceae) from Eurasia comprises about 150 mostly diploid species adapted to and conditions. The group is taxonomically complicated with different and contradictory taxonomic treatments, and was thought to include a considerable number of hybrid species, as the taxa show an admixture of assumed morphological key characters. We studied the phylogeny of the subgenus, covering all existing taxonomic groups and their entire geographic distribution. We analyzed sequences of the nuclear rDNA internal transcribed spacer region (ITS) for multiple individuals of more than 100 species. Phylogenetic analyses of cloned and directly sequenced PCR products confirmed the monophyly of the subgenus, while most sections were either para- or polyphyletic. The splits of the large sections are supported by differences in the anatomy of flower nectaries. ITS data (i) demand a new treatment at sectional level, (ii) do not support the hypotheses of frequent gene flow among species, (iii) indicate that multiple rapid radiations occurred within different monophyletic groups of the subgenus, and (iv) detected separately evolving lineages within three morphologically clearly defined species (cryptic species). In two cases these lineages were close relatives, while in Allium darwasicum they fall in quite different clades in the phylogenetic tree. Fingerprint markers show that this result is not due to ongoing introgression of rDNA (ITS capture) but that genome-wide differences between both lineages exist. Thus, we report one of the rare cases in plants where morphologically indistinguishable diploid species occurring in mixed populations are non-sister cryptic species. (C) 2008 Elsevier Inc. All rights reserved.
机译：欧亚大陆的黑变种（Alliaceae）的亚属包括约150个适应和适应条件的大部分二倍体物种。该组在分类学上具有不同和相互矛盾的分类学处理方法，并被认为包括相当数量的杂种，因为该分类组显示出假定的形态关键特征的混合体。我们研究了亚类的系统发育，涵盖了所有现有的分类学组群及其整个地理分布。我们分析了100多个物种的多个个体的核rDNA内部转录间隔区（ITS）的序列。克隆和直接测序的PCR产物的系统发育分析证实了该亚属的单亲性，而大多数切片是近亲或多亲的。大断面的分裂由花蜜的解剖学差异支持。 ITS数据（i）要求在截面水平上进行新的处理，（ii）不支持物种间基因频繁流动的假设，（iii）表明在该亚属的不同单系群内发生了多次快速辐射，并且（iv）在三个形态明确定义的物种（隐性物种）内分别进化的宗族。在两个案例中，这些谱系是近亲，而在葱属葱属中，它们属于系统发育树中完全不同的进化枝。指纹标记显示此结果不是由于rDNA的渗入（ITS捕获），而是两个谱系之间存在全基因组差异。因此，我们报告了植物中罕见的情况之一，其中混合种群中形态上无法区分的二倍体物种是非姐妹隐性物种。 （C）2008 Elsevier Inc.保留所有权利。

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