Phylogenetic Relationship of <i>Dendrobium</i> Species in Thailand Inferred from Chloroplast <i>matK</i> Gene and Nuclear rDNA ITS Region

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  • Srikulnath Kornsorn
    Department of Genetics, Faculty of Science, Kasetsart University Center for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart University (CASTNAR, NRU-KU)
  • Sawasdichai Sunisa
    Department of Genetics, Faculty of Science, Kasetsart University
  • Jantapanon Tanarat K.
    Department of Genetics, Faculty of Science, Kasetsart University
  • Pongtongkam Pradit
    Department of Genetics, Faculty of Science, Kasetsart University Center for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart University (CASTNAR, NRU-KU)
  • Peyachoknagul Surin
    Department of Genetics, Faculty of Science, Kasetsart University Center for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart University (CASTNAR, NRU-KU)

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Other Title
  • 葉緑体 <i>matK</i> 遺伝子と核内リボソーム DNA の ITS 領域からみたタイのデンドロビウム属植物の系統発生学的類縁関係
  • Phylogenetic Relationship of Dendrobium Species in Thailand Inferred from Chloroplast matK Gene and Nuclear rDNA ITS Region

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Abstract

In Thailand, Dendrobium is the most popular crop grown for cut flowers and as a pot plant for local use and export. Some native species are used for hybrid production while some are specific to particular parts of the country and need to be conserved. The sequences of rDNA ITS (ITS1-5.8S-ITS2) and the matK gene were used to reconstruct the phylogenetic relationships of 27 native Dendrobium spp. in Thailand, which are composed of 9 sections: Breviflores, Callista, Dendrobium, Distichophyllum, Formosae, Pedilonum, Rhopalanthe, Stachyobium, and Strongyle. The average levels of nucleotide divergence (p-distances) of matK and rDNA ITS sequences were 1.3% and 11.2%, respectively. The topologies of the phylogenetic trees reconstructed based on matK and rDNA ITS sequences were slightly different. Use of the rDNA ITS sequence was shown to be a more authoritative systematic approach than use of the matK gene sequence in the genus Dendrobium. The result of the combined data (matK-rDNA ITS) was highly similar to the result from rDNA ITS. From rDNA ITS and combined data, the twenty-seven Dendrobium spp. were clearly grouped into two clades with some differences from the morphological classification. The present study provides the first molecular phylogeny of 27 native Dendrobium species in Thailand.

Journal

  • The Horticulture Journal

    The Horticulture Journal 84 (3), 243-252, 2015

    The Japanese Society for Horticultural Science

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