Phylogeographic study reveals the origin and evolutionary history of a Rhododendron species complex in Taiwan
Phylogeographic study reveals the origin and evolutionary history of a Rhododendron species complex in Taiwan
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DOI：
10.1016/j.ympev.2006.06.027
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发表时间：
2007-01-01
影响因子：
4.1
通讯作者：
Hwang, Shih-Ying
中科院分区：
文献类型：
--
作者：
Chung, Jeng-Der;Lin, Tsan-Piao;Hwang, Shih-Ying
摘要本研究以叶绿体DNA变异为基础，推测台湾假菊杜鹃种复合体的起源单一且曾广泛分布。在总共124个人从5个特有杜鹃花物种用于扩增两个叶绿体基因间间隔区：trnL-trnF和atpB-rbcL。R. pseudochryanthum complex，由R. pseudochrysanthum，R. morii、红点杜鹃和红点杜鹃的生长速率高于台湾杜鹃。两个成对的群体分化，N-ST和F-ST，始终显示大多数非显着水平的遗传分化之间的R. pseudochryanthum复杂的群体。四种红腹锦鸡儿的遗传差异不明显。pseudochryanthum复合体的分子方差分析（AMOVA），这与该复合体的cpDNA单倍型的简约拓扑结构一致。cpDNA单倍型的巢式进化枝分析（NCA）表明，限制性基因流与距离隔离的特征，在R。假菊花复合体与此相反，NCA分析表明，一个连续的范围扩大的cpDNA单倍型的R。福尔摩沙这项研究表明，曾经广泛分布的R。pseudochryanthum复杂可能通过北到南殖民中期clevations在低温时期的更新世。人口破碎化伴随着全新世开始的温暖气候，导致今天的范围收缩到高海拔地区。(c)2006爱思唯尔公司All rights reserved.
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.