Circumscription of Primula subgenus Auganthus (Primulaceae) based on chloroplast DNA sequences
Circumscription of Primula subgenus Auganthus (Primulaceae) based on chloroplast DNA sequences
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DOI：
10.1111/j.1759-6831.2010.00068.x
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发表时间：
2010-03-01
影响因子：
3.7
通讯作者：
Hao, Gang
中科院分区：
文献类型：
--
作者：
Yan, Hai-Fei;He, Chong-Hua;Hao, Gang
最近的分子系统发育分析，报春花属大大提高了我们的属的属下关系的理解，但亚属Auganthus和Racinella仍然是贫乏的采样和了解甚少。本研究利用叶绿体matK、rps 16和trnL-F三个区域的核苷酸序列数据对Auganthus亚属和Escherichiella亚属的系统发育关系进行了推测。对70种报春花属植物及其近缘种进行了序列分析。数据矩阵包括Auganthus亚属29种（42%）和Caroline/la亚属5种（50%）。系统发育分析表明，这些亚属的样本种不形成一个单系分支，但分散在亚属Auganthus的物种。因此，无论是亚属Auganthus或Atominella是单系在其目前的环境。先前被用作亚属Caroline/la的诊断标准的独特帽状蒴果被推断为在报春花属中基于单生演化已经进化了多次。我们的分析也证实了Cortusa是嵌套在亚属Auganthus。因此，我们建议修改的限制亚属Auganthus包括亚属卡罗琳/la和属Cortusa。几个分支被确定为这个广泛定义的亚属Auganthus的系统发育分析，但他们的关系仍然没有完全解决。
Recent molecular phylogenetic analyses of Primula have greatly enhanced our understanding of the infrageneric relationships of the genus, but the subgenera Auganthus and Carolinella remain meagerly sampled and poorly understood. In the present study, nucleotide sequence data of three chloroplast DNA regions (matK, rps16, and trnL-F) were used to infer phylogenetic relationships of the subgenera Auganthus and Carolinella. Sequence data were acquired and analyzed for 70 species of Primula and its close relatives. The data matrix included 29 species (42%) of subgenus Auganthus and five species (50%) from subgenus Caroline/la. Phylogenetic analyses on these data showed that the sampled species of the subgenus Carolinella do not form a monophyletic clade, but are dispersed among the species of the subgenus Auganthus. Therefore, neither subgenus Auganthus nor Carolinella is monophyletic under their current circumscriptions. The distinctive calyptrate capsule that was previously used as a diagnostic criterion for subgenus Caroline/la was inferred to have evolved multiple times in Primula based on the phylogeny. Our analysis also confirmed that Cortusa is nested within subgenus Auganthus. We therefore suggest a revised circumscription of subgenus Auganthus to include subgenus Caroline/la and the genus Cortusa. Several clades were identified with this broadly defined subgenus Auganthus by the phylogenetic analyses, but their relationships remain incompletely resolved.