Abstract
Species identification of five Dendrobium plants was conducted using phylogenetic analysis and the validity of the method was verified. Some Dendrobium plants (Orchidaceae) have been used as herbal medicines but the difficulty in identifying their botanical origin by traditional methods prevented their full modern utilization. Based on the emerging field of molecular systematics as a powerful classification tool, a phylogenetic analysis was conducted using sequences of two plastid genes, the maturase-coding gene (matK) and the large subunit of ribulose 1,5-bisphosphate carboxylase-coding gene (rbcL), as DNA barcodes for species identification of Dendrobium plants. We investigated five medicinal Dendrobium species, Dendrobium fimbriatum, D. moniliforme, D. nobile, D. pulchellum, and D. tosaense. The phylogenetic trees constructed from matK data successfully distinguished each species from each other. On the other hand, rbcL, as a single-locus barcode, offered less species discriminating power than matK, possibly due to its being present with little variation. When results using matK sequences of D. officinale that was deposited in the DNA database were combined, D. officinale and D. tosaense showed a close genetic relationship, which brought us closer to resolving the question of their taxonomic identity. Identification of the plant source as well as the uniformity of the chemical components is critical for the quality control of herbal medicines and it is important that the processed materials be validated. The methods presented here could be applied to the analysis of processed Dendrobium plants and be a promising tool for the identification of botanical origins of crude drugs.
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Acknowledgments
We are grateful to Dr. Setsuko Sekita of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University for her helpful comments. We thank Dr. Li Heng of Kunming Institute of Botany and Dr. Kohji Karasawa for their advice on Orchid taxonomy. We also thank Dr. Masayuki Hatta of Ochanomizu University for his help in interpreting the phylogenetic trees. Our thank goes to Dr. Yuko Shimamura of Ochanomizu University for her technical advice. We appreciate the kind sample offering from Mr. Toraichiro Seki and The Hiroshima Botanical Garden. Part of this research was financially supported by the Ministry of Health, Labor and Welfare.
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Asahina, H., Shinozaki, J., Masuda, K. et al. Identification of medicinal Dendrobium species by phylogenetic analyses using matK and rbcL sequences. J Nat Med 64, 133–138 (2010). https://doi.org/10.1007/s11418-009-0379-8
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DOI: https://doi.org/10.1007/s11418-009-0379-8