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Abstract Detail

Systematics Section / ASPT

Tsai, Chi-Chu [1], Chiang, Yu-Chung [2], Huang, Sheng-Chung [3], Chou, Chang-Hung [4].

Phylogenetics and biogeography of the Phalaenopsis amabilis complex inferred from internal transcribed spacer of nuclear DNA.

The internal transcribed spacers 1 and 2 (ITS1+ITS2) region of nuclear ribosomal DNA (nrDNA) was applied to reconstruct the phylogeny of the Phalaenopsis amabilis complex. Rooted at outgroups, monophyly of the species complex was significantly supported in the Neighbor-joining tree. Within accessions of P. amabilis and its subspecies, different locations of P. amabilis and its subspecies formed different separated clades with exceptions of Palawan and Borneo populations plus Timor population and P. amabilis subsp. rosenstromii. Furthermore, P. aphrodite from different locations and its subspecies could not be separated from each other, but all of them were separable from others of P. amabilis complex. In addition, accessions of P. sanderiana were nested within accessions of both P. amabilis and its subspecies. This result does not support P. sanderiana being treated as a separate species from P. amabilis. According to the phylogenetic tree derived from ITSs of nrDNA, the Palawan population of P. amabilis was suggested as being the origin group of the P. amabilis complex. P. aphrodite and P. sanderiana descended from P. amabilis (or their most recent common ancestor) were suggested. In addition, the evolutionary trend of the P. amabilis complex included three different lineages corresponding to three different dispersal pathways. First, P. amabilis distributed in Palawan dispersed into southern Mindanao and evolved into P. sanderiana, thereafter further dispersing into Sulawesi and New Guinea, from which P. amabilis subsp. moluccana and P. amabilis subsp. rosenstromii respectively developed. P. amabilis subsp. rosenstromii further dispersed into Northern Australia and Timor. Second, P. amabilis distributed in Palawan dispersed into Borneo, thereafter further dispersing into Mentawai Is. Third, the Palawan population of P. amabilis dispersed into other islands of the Philippines, P. aphrodite evolved. And then, P. aphrodite is distributed throughout the Philippines with the exceptions of Palawan and southern Mindanao

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1 - Kaohsiung District Agricultural Research and Extension Station, Crop Improvement Division, Pingtung, 900, Taiwan
2 - Pingtung University of Science and Technology, Department of Life Sciences, Depart. Life Science, NPUST,, No. 1, Hseuhfu Rd. Neipu, Pingtung, 912, Taiwan
3 - Agricultural Research Institute, National Plant Genetic Resources Center, Taichung, 413, Taiwan
4 - China Medical University, Research Center for Biodiversity, Taichung, 404, Taiwan

Phalaenopsis amabilis complex
internal transcribed spacer.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P59068
Abstract ID:962

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