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KMID : 0368419990420020168
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Journal of Plant Biology
1999 Volume.42 No. 2 p.168 ~ p.173
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Molecular Evidence for the Phylogenetic Position of Hanabusaya asiatica Nakai(Campanulaceae), an Endemic Species in Korea
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Kim, Young Dong
Lee, Joon Ku/Suh, Young Bae/Lee, Sang Tae/Kim, Sung Hee/Jansen, Robert K.
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Abstract
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The phylogenetic relationship of the Korean endemic genus, Hanabusaya, to other campanulaceous genera has been controversial since it was described by Nakai in 1911. Three genera of Campanuloideae, Symphyandra, Adenophora, and Campanula, have been considered closely related by various taxonomists on the basis of anther shape, gross morphology, and pollen characters, respectively. We have tested these competing taxonomic hypotheses using the internal transcribed spacer (ITS) sequences of nuclear ribosomal DMA from 12 taxa representing 7 genera of Campanulaceae. The molecular phytogeny indicates strongly that Hanabusaya is more closely allied to Adenophora than to Campanula or Symphyandra. The phylogenetic affinity of Hanabusaya and Adenophora is supported by a 100% bootstrap value and a high decay index (13). The average sequence divergence value (Kimura´s 2-parameter method) between Hanabusaya and the Adenophora species is 2.58. The value is significantly (about ten times) lower than the ones observed between Hanabusaya and the species of Campanula (average of 23.52) and between Hanabusaya and Symphyandra (24.95). The ITS sequence phylogeny suggests that some morphological characters, such as fused anthers and corolla shape, are homoplastic in the Campanulaceae genera.
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