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Molecular phylogeny of the genus Hypericum (Hypericaceae) from Korea and Japan: evidence from nuclear rDNA ITS sequence data

한국식물학회지 2004년 47권 4호 p.366 ~ 374
박선주 ( Park Seon-Joo ) - Yeungnam University Department of Biology

김기중 ( Kim Ki-Joong ) - Korea University School of Life Sciences and Biotechnology

Abstract


As part of our ongoing phylogenetic study of genusHypericum, nuclear ribosomal DNA internal transcribed spacer sequences were analyzed for 36 species ofHypericum as ingroup and two species ofThornea as outgroup. This sampling included most of the previously described species from both Korea and Japan. The ITS phylogeny suggested that the surveyedHypericum species belong to a monophyletic section,Trigynobrathys, and a polyphyletic section,Hypericum. In addition, two monotypic sections,Sampsonia andRoscyna, were identified. Members of sectionHypericum occur in four different lineages worldwide, which imply at least four independent origins. The Korean and Japanese species of sectionHypericum form a monophyletic group, except forH. vulcanicum. Instead, that particular species belongs to a distinct monophyletic group withH. scoreri andH. formosa from other geographic areas, and is a sister to sectionTrigynobrathys. The Korean and Japanese species of sectionTrigynobrathys show a monophyletic origin.H. sampsonii is now recognized as a distinct section rather than being a member of sectionsHypericum orDrosocarpium, as had been indicated previously. Our results differ somewhat from those of recent morphological and cytological studies. The phylogenetic relationships among Korean and Japanese species have now been mostly resolved via ITS phylogeny.

키워드

cladistic analysis; Hypericaceae; Hypericum; maximum likelihood value; monophyletic group; nuclear ITS phylogeny
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