Phylogenetic reconstruction of Chirita and allies (Gesneriaceae) with taxonomic treatments
Phylogenetic reconstruction of Chirita and allies (Gesneriaceae) with taxonomic treatments
复制标题
通过分类学处理对 Chirita 及其近缘植物（苦苣苔科）进行系统发育重建
DOI：
10.1111/j.1759-6831.2010.00113.x
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发表时间：
2011-01-01
影响因子：
3.7
通讯作者：
Smith, James F.
中科院分区：
文献类型：
--
作者：
Wang, Yin-Zheng;Mao, Ru-Bing;Smith, James F.
奇里塔湾Don是苦苣苔科（Gesneriaceae）贯众亚科（Cyrtandroideae）中的一个大属，其是否为一个自然类群一直存在争议。此外，高度异质的Chirita在划界和细分方面也存在很大问题。本文利用nrDNA内转录间隔区和cpDNAtrnL-F结合形态学数据进行分子系统学分析。我们的研究结果表明，唇柱苣苔是一个人工的，多系属。定义唇柱苣苔的最重要的特征，背腹斜和双层柱头，已经在二雄蕊的Cyrtandroideae的不同分支中收敛地进化。严格意义上的唇柱苣苔只包括唇柱苣苔组的种类，而唇柱苣苔组小唇柱苣苔是一个独立的分支，位于系统发育树的基底节点。唇柱苣苔组Liebigia是密切相关的Didymocarpus与一个完整的柱头不同于其他种类的唇柱苣苔。唇柱苣苔属的种类包括Gibbosaccus、Chiritopsis、Primulina和Wentsaiboea，它们形成了一个单系群，该群与一个强有力的支持分支姐妹，该分支包括四个单型属Paralagarosolen、Calcareoboea、Petrocodon和Tengia。我们进一步分析了唇柱苣苔属的形态进化，并确定了一系列的单系群的形态学突触，从而在这项研究中提供了一个分类处理。
Chirita D. Don, a large genus in the subfamily Cyrtandroideae of Gesneriaceae, has been the subject of much debate whether it is a natural group or not. In addition, the highly heterogeneous Chirita has also been very problematic with regard to delimitation and subdivision. Here we used the nrDNA internal transcribed spacer and cpDNA trnL-F for molecular phylogenetic analaysis, combined with morphological data. Our results suggest that Chirita is an artificial, polyphyletic genus. The most important character that defines Chirita, the dorso-ventrally oblique and bilamellar stigma, has evolved convergently in different clades of diandrous Cyrtandroideae. Chirita sensu strict only includes the species of Chirita sect. Chirita, whereas Chirita sect. Microchirita is an independent clade located at the basal node of the phylogenetic tree. Chirita sect. Liebigia is closely related to Didymocarpus with an entire stigma unlike other species of Chirita. The species of Chirita sect. Gibbosaccus, Chiritopsis, Primulina, and Wentsaiboea form a monophyletic group that is sister to a strongly supported clade comprising four monotypic genera Paralagarosolen, Calcareoboea, Petrocodon, and Tengia. We further analyzed the morphological evolution of Chirita and identified a series of morphological synapomorphies for the monophyletic groups revealed herein, and thereby provide a taxonomic treatment in this study.