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首页> 外文期刊>Systematic Botany >Elucidating Phylogenetic Relationships in the Aechmea Alliance: AFLP Analysis of Portea and the Gravisia Complex (Bromeliaceae, Bromelioideae)
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Elucidating Phylogenetic Relationships in the Aechmea Alliance: AFLP Analysis of Portea and the Gravisia Complex (Bromeliaceae, Bromelioideae)

机译：阐明Aechmea联盟中的亲缘关系：门廊和Gravisia复合体（凤梨科，凤梨科）的AFLP分析

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摘要

Genetic concepts within the Bromelioideae are highly problematic, in particular within the tank-forming "core bromelioid" clade. Previous molecular studies showed that the largest genus, Aechmea, and allied genera are polyphyletic and require revision. Here we focus on one group within the Aechmea alliance, the Portea/Gravisia group. To assess whether species of this group form a distinct lineage within the core bromelioid clade, and to clarify generic limits and interspecific relationships within the group, we generated and analyzed amplified fragment length polymorphisms (AFLP). In total, 69 species were sampled, including 26 species previously assigned to the Portea/Gravisia group. Neighbor joining, maximum likelihood and Bayesian analyses of the AFLP data consistently retrieved the Portea/Gravisia group as a monophyletic clade with several subclades, comprising species from the genera Aechmea, Canistrum and Portea. The phylogenetic distribution of polyporate pollen of the resulting trees indicates this character state arose once within the core bromelioids and thus can be regarded as a synapomorphy for the Portea/Gravisia clade. Further, our study shows that within the Portea/Gravisia group, subclades are characterized by petal color and geographic distribution. Thus, the present study is a further advance in the challenging task of elucidating phylogenetic relationships within the core bromelioids as the basis for a revised taxonomy of this ecologically important group.
机译：凤梨科内的遗传概念存在很大问题，特别是在形成罐的“核心类菠萝”进化枝内。先前的分子研究表明，最大的属Aechmea和相关属是多属的，需要修改。在这里，我们专注于Aechmea联盟中的一个小组，即Portea / Gravisia小组。为了评估该组物种是否在核心类菠萝进化枝内形成独特的谱系，并弄清该组内的通用限制和种间关系，我们生成并分析了扩增的片段长度多态性（AFLP）。总共采样了69种，包括先前分配给Portea / Gravisia组的26种。对AFLP数据的邻居加入，最大似然和贝叶斯分析一致地将Portea / Gravisia组检索为具有几个子分支的单系进化分支，包括来自Aechmea，Canistrum和Portea属的物种。所形成树木的多孔花粉的系统发育分布表明，这种性状一旦出现在核心类纤毛虫内，因此可以被视为Portea / Gravisia进化枝的同形。此外，我们的研究表明，在Portea / Gravisia组中，子瓣的特征是花瓣的颜色和地理分布。因此，本研究是一项具有挑战性的任务的进一步进展，该任务是阐明核心类胡萝卜素内的系统发育关系，以此作为对该具有生态重要性的群体进行分类的基础。

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