Molecular phylogeny of the genus Physconia (Ascomycota, Lecanorales) inferred from a Bayesian analysis of nuclear ITS rDNA sequences
Molecular phylogeny of the genus Physconia (Ascomycota, Lecanorales) inferred from a Bayesian analysis of nuclear ITS rDNA sequences
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DOI：
10.1017/s095375620400975x
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发表时间：
2004-05-01
影响因子：
--
通讯作者：
Lumbsch, HT
中科院分区：
文献类型：
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作者：
Cubero, OF;Crespo, A;Lumbsch, HT
利用核糖体DNA内转录间隔物（ITS）序列的贝叶斯分析方法推测了14种水藻的系统发育关系。分析结果支持该属的单系性。在Physconia中可以区分出三个支撑力较好的分支：griseae系列、venustae系列和粉粒ae系列。然而，这些分支之间的关系还不能确定。在系统发育假说的基础上，对皮质特征进行了重新评价。上皮层的解剖特征仅在种水平以上对两种特殊形式的双层皮层具有诊断性，而形态学特征，如下表面和根茎型是不同进化枝的特征。在本分析中，没有将黑桫椤和黑桫椤分开，但美洲桫椤种群与欧洲和北美的美洲桫椤种群有明显的区别，美洲桫椤和美洲桫椤的单系分布都很明显。在贝叶斯假设检验的基础上被拒绝。
A Bayesian analysis of nuclear ribosomal DNA internal transcribed spacer (ITS) sequences was used to infer phylogenetic relationships of 14 Physconia species. The analysis supports the monophyly of the genus. Three well supported clades can be distinguished within Physconia: the series griseae, venustae and pulverulentae. The relationships of these clades, however, is not resolved with confidence. Cortical characters are re-evaluated on the basis of the phylogenetic hypothesis. Anatomical features of the upper cortex are only diagnostic above the species level for two special forms of two-layered cortices, while morphological characters, such as lower surface and rhizine-type are characteristic for distinct clades. P. venusta and P. perisidiosa are not separated in this analysis, but populations of P. muscigena, and European and North American samples of P. americana are clearly distinct and the monophyly of both P. americana and P. muscigena s. lat. is rejected on the basis of a Bayesian hypothesis testing.