Rediscovery of Cystoathyrium chinense Ching (Cystopteridaceae): Phylogenetic placement of the critically endangered fern species endemic to China
Rediscovery of Cystoathyrium chinense Ching (Cystopteridaceae): Phylogenetic placement of the critically endangered fern species endemic to China
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DOI：
10.1111/jse.12075
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发表时间：
2014-07
影响因子：
3.7
通讯作者：
Ran Wei;Xian-chun Zhang
中科院分区：
文献类型：
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作者：
Ran Wei;Xian-chun Zhang
中国囊蕨Cystoathyrium chinense Ching是囊蕨属的唯一代表，是我国特有的极危物种，现存个体不超过40个。到目前为止，它的系统位置和薄囊蕨之间的关系仍然未知。本研究利用3个叶绿体DNA标记（matK、rbcL和trnG-R间隔区）对中国囊蕨（Cystoathyrium chinense）及其近缘种的系统发育关系进行了研究。我们的研究结果支持包括Cystoathyrium在Cystopteris。本研究既不支持也不否定Cystoathyrium chinense的杂种起源假说。根据我们的祖先区域重建分析，Cystoathyrium及其密切相关的北美分类群的间断分布可能归因于通过Beringia的远距离传播。因此，本文报道了一个新组合（Cystopteris chinensis comb. nov.）并根据我们在实地的新观察对这一描述进行了补充。
Cystoathyrium chinense Ching, the sole representative of Cystoathyrium, is a critically endangered species endemic to China with no more than 40 extant individuals. Until now, its systematic position and relationships among leptosporangiate ferns remained unknown. The present study assessed the phylogenetic relationships of Cystoathyrium chinense with potential relatives densely sampled using three chloroplast DNA markers (matK, rbcL, and trnG‐R intergenic spacer). Our results support the inclusion of Cystoathyrium in Cystopteris. A hybrid origin hypothesis of Cystoathyrium chinense is neither supported nor rejected by the present study. According to our ancestral area reconstruction analysis, the disjunct distribution of Cystoathyrium and its closely related North American taxa may be attributed to the long‐distance dispersal by way of Beringia. Consequently, a new combination (Cystopteris chinensis comb. nov.) is made, and the description is supplemented based on our new observations in the field.