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Inclusion of the Eastern Asia endemic genus Sorolepidium in Polystichum (Dryopteridaceae):Evidence from the chloroplast rbcL gene and morphological characteristics

查看全文 作　　者：LIU [1,2]HongMei;ZHANG [1]XianChun;CHEN [1]ZhiDuan;QIU [3]YinLong 高影响力作者 机构地区：[1]State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;[2]Graduate University of the Chinese Academy of Sciences, Beijing 100039, China;[3]Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA高影响力机构 出　　处：《Chinese Science Bulletin》索引2007年第52卷第5期,共8页高影响力期刊 基　　金：Supported by the National Natural Science Foundation of China (Grant No. 30228004);Wong Kuan Chung Education Foundation of Hong Kong 摘　　要：The taxonomic status of the Eastern Asia endemic Sorolepidium is controversial. Some authors accept it as member of the large diverse genus Polystichum, whereas others suggest that it is an independent genus separated from the later by the exindusiate sorus and the absence of aristate teeth at the pinnae margins. Here we infer phylogenetic relationship of Sorolepidium using DNA sequences of the chloro-plast rbcL gene. Phylogenies were inferred using maximum-parsimony, maximum-likelihood, and Bayesian inference methods. Molecular data establish that Sorolepidium is deeply nested within the large genus Polystichum and has a close relationship with P. duthiei and P. lachenense in the model-based analyses. The Kimura 2-parameter distances of the rbcL sequences between S. glaciale and P. duthiei and P. lachenense were 0.1 and 0.2%, respectively. Furthermore, S. glaciale differed from P. duthiei by a single nucleotide in their rbcL sequences. Close relationships between S. glaciale and P. duthiei and P. lachenense are also supported by the shared spore ornamentation with echinate fenes-trate folds. 关 键 词：耳蕨 玉龙蕨属 东亚特有种 叶绿体rbcL基因 形态特征 分类地位
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