Chou, Yen-Wei , Thomas, Philip , Wang, Chun-Neng .
The phylogeography of Taiwania cryptomerioides, a living fossil remains in Taiwan, China and Vietnam.
Taiwania cryptomerioides is one of the Asiatic Tertiary relic gymnosperms like other living fossils such as Ginkgo and Metasequoia. Fossil and pollen record evidence indicated that it was once widespread in Eurasia and even North America but now only disperses in Taiwan, SW China, northern Myanmar and northern Vietnam. Until now, no extensive phylogeographic study has ever been conducted to these surviving populations. Here we sequenced four cpDNA regions (petG-trnP, trnH-psbA, trnL intron, and trnL-trnF intergenic spacers) and one nuclear region (NEEDLY second intron) to analyze the genetic variation among T. cryptomerioides individuals in Taiwan, China and a recently discovered population in Vietnam. Only ten haplotypes were distinguished based on petG-trnP and trnH-psbA data, implying low genetic variations in extant T. cryptomerioides individuals. All Taiwanese individuals consist only one haplotype, which is absent in the mainland individuals (Chinese and Vietnamese individuals). The huge genetic distance between Taiwan and the mainland was revealed by the haplotype network and the fact that 13 out of 19 polymorphic sites of petG-trnP and trnH-psbA region have unique DNA sequence in this Taiwanese haplotype. Four out of the seven haplotypes found in the single Vietnamese population are shared with Chinese haplotypes, implying a closer relationship between the Chinese and Vietnamese populations. The relatively high intra and inter population genetic variation among mainland populations suggests that these populations are perhaps remnants of the glacial Taiwania refugia. The spreading of only one haplotype linage of Taiwania from the mainland to the Taiwan Island is an intriguing finding, and suggests that major Taiwanese populations were derived from a single dispersal event in the past.
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1 - National Taiwan University, Institute of Ecology and Evolutionary Biology, No.1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
2 - Royal Botanic Garden Edinburgh, 20 A Inverleith Row, Edinburgh, Scotland, EH3 5LR, UK
3 - National Taiwan University, Department of Life Science, Institute of Ecology and Evolutionary Biology, No.1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
Presentation Type: Oral Paper:Papers for Topics
Date: Monday, July 28th, 2008
Time: 3:00 PM