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《Journal of Agricultural University of Hebei》 2005-02
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Phylogenetic placement of Onychium based on the analysis of rbcL sequences

YANG Wen-li~1,ZHANG Gang-min~2(1.Department of Landscape and Tour, Agricultural University of Hebei, Baoding 071000, China;2. Beijing Forestry University, Beijing 100083, China)  
The systematic position of the genus Onychium Kaulf. has long been in dispute. In this paper, the chloroplast DNA rbcL region was sequenced for 10 species representing Onychium, Cryptogramma, Aleuritopteris, Leptolepidium, Cheilosoria, and Doryopteris. Phylogenetic analysis was conducted using the maximum-parsimony (MP) method, with two species of Lindsaeaceae being selected as the outgroup. The results of phylegenetic analysis show that: ①cheilanthoid is a monophyletic group strongly supported by a bootstrap value of 100%, which comprises most of the genera in Sinopteridaceae sensu Ching and some genera in Hemionitidaceae sensu Pichi-Sermolli. ②Cryptogramma, Llavea, and Coniogramme form a clade with a high bootstrap value. ③Onychium is robustly nested within the pteroid clade, and closely related to Pteris. In the light of molecular phylogeny, the genus Onychium belongs to neither Sinopteridaceae nor Cryptogrammaceae sensu Pichi-Sermolli but should belong to the family of Pteridaceae sensu Nayar.
【Fund】: 中国科学院生物科学与生物技术研究特支项目
【CateGory Index】: Q949.36
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