Paraphyly of Cyrtomium (Dryopteridaceae): evidence from rbcL and trnL-F sequence data |
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Authors: | Jin-Mei Lu De-Zhu Li Lian-Ming Gao Xiao Cheng Ding Wu |
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Institution: | (1) Laboratory of Plant Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Heilongtan, Kunming, Yunnan Province, 650204, People s Republic of China;(2) Graduate School of the Chinese Academy of Sciences, Beijing, 100039, People s Republic of China |
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Abstract: | Cyrtomium is an Asiatic genus characterized by anastomosing veins with included veinlets, and comprises about 40 species. We sequenced rbcL and trnL-F sequences of 19 species of Cyrtomium and eight species from related genera in order to elucidate a molecular phylogeny of the genus using maximum-parsimony methods. The phylogenetic trees did not agree with traditional classifications. Cyrtomium was resolved as paraphyletic, and a clade including subseries Balansana of Cyrtomium, Cyrtogonellum, Polystichum subacutidens and Cyrtomidictyum (the BCPC clade) and a second one containing Cyrtomium sensu stricto were monophyletic. The results also implied that: (1) C. uniseriale was synonymous with C. balansae; (2) C. falcatum was likely the female parent of C. devexiscapulae; and (3) based on the rbcL and trnL-F sequence data, C. nephrolepioides and C. grossum were the female parents of C. shingianum and C. chingianum, respectively, although other evidence is needed for the confirmation of this hypothesis. |
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Keywords: | Cyrtomium Molecular phylogeny Paraphyly rbcL trnL-F |
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