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https://irlib.pccu.edu.tw/handle/987654321/2715
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| 題名: | Phylogeographic study reveals the origin and evolutionary history of a Rhododendron species complex in Taiwan |
| 作者: | Chung, Jeng-Der
Lin, Tsan-Piao
Chen, Yu-Ling
Cheng, Yu-Pin
Hwang, Shih-Ying |
| 貢獻者: | 生科所 |
| 關鍵詞: | cpDNA
evolutionary origin
phylogeography
Rhododendron
species complex
Taiwan |
| 日期: | 2007 |
| 上傳時間: | 2009-11-16 11:04:36 (UTC+8) |
| 摘要: | This study infers a single origin and a once-widespread distribution of the Rhododendron pseudochrysanthum species complex in Taiwan based on chloroplast DNA (cpDNA) variation. In total, 124 individuals from five endemic Rhododendron species were used for amplifications of two chloroplast intergenic spacers: trnL-trnF and atpB-rbcL. The haplotype and nucleotide diversities were much lower for the R. pseudochrysanthum complex, comprised of the species R. pseudochrysanthum, R. morii, Rhododendron rubropunctatum, and Rhop dodendron hyperythrum, than for Rhododendron formosanum. Two measures of pairwise population differentiation, N-ST and F-ST, consistently revealed mostly non-significant levels of genetic divergence between populations of the R.pseudochrysanthum complex. No genetic difference was found among the four species of the R. pseudochrysanthum complex by analysis of molecular variance (AMOVA), which is concordant with the parsimonious topology of cpDNA haplotypes for the complex. Nested clade analysis (NCA) of the cpDNA haplotypes indicated that restricted gene flow with isolation-by-distance characterized the recolonization pattern of the R. pseudo chrysanthum complex. In contrast, the NCA analysis indicated a contiguous range expansion for cpDNA haplotypes of R. formosanum. This research suggests a once-widespread distribution of the R. pseudochrysanthum complex probably via north-to-south colonization of mid-clevations during low-temperature periods of the Pleistocene. Population fragmentation followed the warmer climate which began in the Holocene and resulted in the present-day range contraction into high elevations. (c) 2006 Elsevier Inc. All rights reserved. |
| 關聯: | MOLECULAR PHYLOGENETICS AND EVOLUTION Volume: 42 Issue: 1 Pages: 14-24 |
| 顯示於類別: | [生物科技研究所 ] 期刊論文
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