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Phylogeny of Abies (Pinaceae) inferred from nrITS sequence data

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Abstract:

Abies comprises ∼48 species with a disjunct distribution in the Northern Hemisphere. Despite the economic and ecological importance of the genus, phylogenetic relationships among the species remain unclear. The complete nuclear ribosomal internal transcribed spacer (ITS) region was sequenced for 31 species of Abies and its outgroup Keteleeria to reconstruct the phylogeny of the genus. The results revealed three small subrepeats with a motif (5′-GGCCACCCTAGTC-3′), that is conserved across Pinaceae, and the 298 bp large subrepeats, specific to Abies occurring in all firs. Phylogenetic analysis of ITS recovered nine of the ten formerly recognized sections (sects. Abies, Amabilis, Balsamea, Bracteata, Grandis, Momi, Nobilis, Piceaster, Pseudopicea). The results suggest merging sect. Oiamel and Grandis. The monophyly of western North American species is suggested with robust support by ML and MP analysis. A close relationship between European and Asian species is also inferred, but with weak support.

Keywords: ABIES; LARGE SUBREPEATS; NUCLEAR RIBOSOMAL INTERNAL TRANSCRIBED SPACER; PHYLOGENY; SMALL SUBREPEATS

Document Type: Research Article

Affiliations: 1: State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, People's Republic of China 2: Department of Plant Biology, North Carolina State University, Raleigh, North Carolina 27695-7612, U.S.A. 3: State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, People's Republic of China; Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China

Publication date: February 1, 2009

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