Phylogenetic analyses of the Bryopsidales (Ulvophyceae, Chlorophyta) based on RUBISCO large subunit gene sequences
Phylogenetic analyses of the Bryopsidales (Ulvophyceae, Chlorophyta) based on RUBISCO large subunit gene sequences
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DOI：
10.1111/j.1529-8817.2006.00230.x
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发表时间：
2006-06-01
影响因子：
2.9
通讯作者：
Zechman, Frederick W.
中科院分区：
文献类型：
--
作者：
Lam, Daryl W.;Zechman, Frederick W.
目前对苔藓科的分类共分为8个科，其中大部分被进一步分为两个亚目：苔藓亚目和哈利米亚科。这一概念得到了基于rRNA序列数据的早期分子系统发育分析的支持，但随后对形态特征的分支分析只在哈利米亚科中单系地推断出来。这些相互矛盾的结果促使目前对来自这一不同绿藻群体的32个分类群进行了分析，这些分类群基于叶绿体编码的Rubisco大亚基(RbcL)基因序列。这些分析结果表明，哈利米亚科和苔藓亚科是截然不同的单系谱系。苔藓科、木犀草科、豆科、德贝西亚科和哈利木科为单系种，乌贼科为非单系种。此外，还推测了属间亲缘关系不确定的两个类群Dichotomosiphon tuberosus Lawson和Pseudocodium floridanum Dawes&Mathieson的系统发育地位。Pseudocodium一直被放置在Halimedine支系中，这表明它被包括到这个亚目中，但亲缘关系没有得到解决。根据对rbcL序列数据的分析，可能是这一亚目的一个成员，因此可能是Halimedineae的姐妹分类群。
Current taxonomy of the Bryopsidales recognizes eight families; most of which are further categorized into two suborders, the Bryopsidineae and Halimedineae. This concept was supported by early molecular phylogenetic analyses based on rRNA sequence data, but subsequent cladistic analyses of morphological characters inferred monophyly in only the Halimedineae. These conflicting results prompted the current analysis of 32 taxa from this diverse group of green algae based on plastid-encoded RUBISCO large subunit (rbcL) gene sequences. Results of these analyses suggested that the Halimedineae and Bryopsidineae are distinct monophyletic lineages. The families Bryopsidaceae, Caulerpaceae, Codiaceae, Derbesiaceae, and Halimediaceae were inferred as monophyletic, however the Udoteaceae was inferred as non-monophyletic. The phylogenetic position of two taxa with uncertain subordinal affinity, Dichotomosiphon tuberosus Lawson and Pseudocodium floridanum Dawes & Mathieson, were also inferred. Pseudocodium was consistently placed within the halimedinean clade suggesting its inclusion into this suborder, however familial affinity was not resolved. D. tuberosus was the inferred sister taxon of the Halimedineae based on analyses of rbcL sequence data and thus a possible member of this suborder.