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KMID : 0368420100530060453
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Journal of Plant Biology
2010 Volume.53 No. 6 p.453 ~ p.460
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Phylogenetics and Biogeography of the Phalaenopsis violacea (Orchidaceae) Species Complex Based on Nuclear and Plastid DNA
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Tsai Chi-Chu
Sheue Chiou-Rong
Chen Chih-Hsiung
Chou Chang-Hung
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Abstract
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The Phalaenopsis violacea complex includes two species: P. violacea Witte and Phalaenopsis bellina (Rchb.f.) E. A. Christ. However, three forms of P. violacea have been found in different areas, including Sumatra, the Malay Peninsula, and Mentawai Island. The phylogenetic tree inferred from the internal transcribed spacer (ITS) region of nuclear ribosomal DNA (nrDNA), the trnL intron, and the atpB-rbcL spacer of plastid DNA were used to clarify the phylogenetics and biogeography of the P. violacea complex. Analyses of the trnL intron sequences and of the atpB-rbcL spacer did not allow for apparent discrimination among these three species of the P. violacea complex. Based on the phylogenetic tree inferred from the ITS sequence, P. bellina cannot be separated from populations of P. violacea, with the exception of the population distributed on Mentawai Is., Indonesia. Based on morphological characteristics, P. violacea distributed on Mentawai Is. has a long and roundish rachis and is separate from the other groups of the P. violacea complex described by Christenson (Timber, Portland, OR, 2001). Therefore, the results of this study show a trend that supports the conclusion that the population of the P. violacea complex on Mentawai Is. is a separate species from P. violacea. Based on the biogeography of the P. violacea complex, Mentawai plants of this complex might be descended from those on the Sumatra/Malay Peninsula.
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KEYWORD
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Phalaenopsis violacea, Species complex, Phylogenetics, Biogeography
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