A phylogenetic study ofPolygonum sect.Tovara (Polygonaceae) based on ITS sequences of nuclear ribosomal DNA |
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Authors: | Suh Youngbae Sangtae Kim Chong -Wook Park |
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Affiliation: | (1) Department of Biology, Seoul National University, 151-742 Seoul, Korea;(2) Natural Products Research Institute, Seoul National University, 110-460 Seoul, Korea |
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Abstract: | Polygonum sect.Tovara comprises three morphologically very similar species;P. virginianum,P. filiforme, andP. neofiliforme. Sequences of internal transcribed spacers (ITSs) of nuclear ribosomal DNA of these were determined to examine phylogenetic relationships and the levels of differentiation among them. The size of ITS 1 was 241 bp inP. filiforme andP. neofiliforme, and 242 bp inP. virginianum. The size of ITS 2 was 243 bp, and that of the 5.8S rRNA coding region was 163 bp. The ITS sequences clearly separate North AmericanP. virginianum from the eastern Asian species. Nucleotide divergence between them ranges from 3.3% to 3.8% for ITS 1 and from 9.3% to 10.7% for ITS 2. The molecular data also revealed that two eastern Asian species are closely related but should be treated as distinct species. |
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Keywords: | Polygonaceae Polygonum sect.Tovara molecular phylogcny ITS disjunct distribution |
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