Phylogeny of Symplocos Based on DNA Sequences of the Chloroplast trnC–trnD Intergenic Region
Phylogenetic analysis of 74 species of Symplocos was conducted with DNA sequence data from the chloroplast trnC-trnD intergenic region. Maximum parsimony and Bayesian inference trees are consistent with those of a previous study based on combined data from the nuclear ribosomal ITS region and the chloroplast regions rpl16, matK, and trnL-trnF. The inclusion of 21 phylogenetically informative indel characters from trnC-trnD resulted in greater maximum parsimony resolution and clade support than with these characters excluded. A combined five-gene-region (trnC-trnD, ITS, rpl16, matK, and trnL-trnF) analysis based on a data set with complete sequence data is almost completely concordant with that of the combined four-gene data set, and displays higher resolution and overall clade support (in some cases 20 to 30 bootstrap percentage points). The data indicate monophyly for only one subgenus (Epigenia) and four sections (Barberina, Cordyloblaste, Neosymplocos, and Urbaniocharis) of Symplocos ; the other three subgenera (Symplocos, Hopea, and Microsymplocos) and tested sections (Bobu, Palaeosymplocos, and Symplocastrum) will require recircumscription to accord with the principle of monophyly. Supermatrix and supertree analyses were conducted to provide phylogenetic estimates based on all 107 available Symplocos samples with sequence data from at least two of the five gene regions. The supermatrix consensus tree is completely consistent with that from the combined five-gene estimate based on complete sequence data, whereas the supertree consensus differs from these trees in two regions of the topology. The supermatrix consensus also displays greater clade resolution than the supertree consensus. The aligned trnC-trnD data set exhibits a lower percentage of parsimony-informative characters than those based on matK and rpl16 sequences. The length, organization, and relative sequencing ease of trnC-trnD in Symplocos nonetheless confirm the utility of this region for phylogenetic estimation in flowering plants, as previously described.
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Document Type: Regular Paper
Publication date: 2006-01-01
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- Systematic Botany is the scientific journal of the American Society of Plant Taxonomists and publishes four issues per year.
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