Phylogenetic and biogeographic analyses of the Sino-Himalayan endemic genus Cyananthus (Campanulaceae) and implications for the evolution of its sexual system.
Phylogenetic and biogeographic analyses of the Sino-Himalayan endemic genus Cyananthus (Campanulaceae) and implications for the evolution of its sexual system.
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DOI：
10.1016/j.ympev.2013.04.027
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发表时间：
2013-09
影响因子：
4.1
通讯作者：
Zhuo Zhou;D. Hong;Yang Niu;Guodong Li;Z. Nie;J. Wen;Hang Sun
中科院分区：
文献类型：
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作者：
Zhuo Zhou;D. Hong;Yang Niu;Guodong Li;Z. Nie;J. Wen;Hang Sun
蓝花属（桔科）是中国-喜马拉雅地区特有的一个小属，约有20种。基于核糖体ITS和4个质体标记（matK、rbcL、psbA-trnH和trnG-S）的系统发育分析，我们的研究结果有力地支持了Cyananthus的单系性及其与桔形纲党参支系的密切关系。该属有3个分支，其中主要分布于喜马拉雅山脉的Cyananthus分支与主要分布于横断山区的Stenolobi和Annui分支是姊妹分支。我们还观察到，花青花在性系统上表现出变异，既有雌雄同体的物种，也有雌蕊异株的物种。利用Mesquite进行的性状进化分析表明，在Stenolobi组中，雌雄同体只从雌雄同体进化了一次，而在C. formosus组中则发生了反转。分子测年和LAGRANGE生物地理分析支持了蓝花在早期演化过程中从喜马拉雅向横断山脉的扩散。
Cyananthus (Campanulaceae) is a small genus consisting of ca. 20 species endemic to the Sino-Himalayan region. Based on phylogenetic analysis using nuclear ribosomal ITS and four plastid markers (matK, rbcL, psbA–trnH and trnG–S), our results strongly support the monophyly of Cyananthus and its close relationship with the Codonopsis clade of the platycodonoids. Three major clades are supported, corresponding to the three sections of the genus, with sect. Cyananthus, which mainly occurs in the Himalayas, being a sister to the clade comprising the other two sections (sect. Stenolobi and sect. Annui) distributed primarily in the Hengduan Mountain region. We also observed that Cyananthus exhibits variation in its sexual system, possessing both hermaphroditic and gynodioecious species. Character evolution analyses using Mesquite suggest that gynodioecy evolved from hermaphroditism only once in sect. Stenolobi, but that there is a reversal in C. formosus. Molecular dating and biogeographic analysis with LAGRANGE support dispersal from the Himalayas to the Hengduan Mountains during the early evolution of Cyananthus. The extensive uplift of the Qinghai–Tibetan Plateau and the Hengduan Mountains played an important role in the subsequent diversification of the genus.