Genetic variation and phylogeographic history of Picea likiangensis revealed by RAPD markers

	Genetic variation and phylogeographic history of Picea likiangensis revealed by RAPD markers
	Peng, Xiao-Li ; Zhao, Chang-Ming ; Wu, Gui-Li ; Liu, Jian-Quan
刊名	TREES-STRUCTURE AND FUNCTION ; Peng XiaoLi,Zhao ChangMing,Wu GuiLi, Liu JianQuan.Genetic variation and phylogeographic history of Picea likiangensis revealed by RAPD markers.TREES-STRUCTURE AND FUNCTION,2007,21(4):457-464
	2007-07-01
英文摘要	Repeated cycles of retreat and recolonization during the Quaternary ice ages are thought to have greatly influenced current species distributions and their genetic diversity. It remains unclear how this climatic oscillation has affected the distribution of genetic diversity between populations of wind-pollinated conifers in the Qinghai-Tibetan region. In this study, we investigated the within-species genetic diversity and phylogenetic relationships of Picea likiangensis, a dominant forest species in this region using polymorphic DNA (RAPD) markers. Our results suggest that this species has high overall genetic diversity, with 85.42% of loci being polymorphic and an average expected heterozygosity (H (E)) of 0.239. However, there were relatively low levels of polymorphism at population levels and the differences between populations were not significant, with percentages of polymorphic bands (PPB) ranging from 46.88 to 69.76%, Nei's gene diversity (H (E)) from 0.179 to 0.289 and Shannon's indices (Hpop) from 0.267 to 0.421. In accordance with our proposed hypothesis, a high level of genetic differentiation among populations was detected based on Nei's genetic diversity (G (ST) = 0.256) and AMOVA analysis (Phi (st) = 0.236). Gene flow between populations was found to be limited (Nm = 1.4532) and far lower than reported for other conifer species with wide distribution ranges from other regions. No clusters corresponding to three morphological varieties found in the south, north and west, respectively, were detected in either UPGMA or PCO analyses. Our results suggest that this species may have had different refugia during the glacial stages in the southern region and that the northern variety may have multiple origins from these different refugia.; Repeated cycles of retreat and recolonization during the Quaternary ice ages are thought to have greatly influenced current species distributions and their genetic diversity. It remains unclear how this climatic oscillation has affected the distribution of genetic diversity between populations of wind-pollinated conifers in the Qinghai-Tibetan region. In this study, we investigated the within-species genetic diversity and phylogenetic relationships of Picea likiangensis, a dominant forest species in this region using polymorphic DNA (RAPD) markers. Our results suggest that this species has high overall genetic diversity, with 85.42% of loci being polymorphic and an average expected heterozygosity (H (E)) of 0.239. However, there were relatively low levels of polymorphism at population levels and the differences between populations were not significant, with percentages of polymorphic bands (PPB) ranging from 46.88 to 69.76%, Nei's gene diversity (H (E)) from 0.179 to 0.289 and Shannon's indices (Hpop) from 0.267 to 0.421. In accordance with our proposed hypothesis, a high level of genetic differentiation among populations was detected based on Nei's genetic diversity (G (ST) = 0.256) and AMOVA analysis (Phi (st) = 0.236). Gene flow between populations was found to be limited (Nm = 1.4532) and far lower than reported for other conifer species with wide distribution ranges from other regions. No clusters corresponding to three morphological varieties found in the south, north and west, respectively, were detected in either UPGMA or PCO analyses. Our results suggest that this species may have had different refugia during the glacial stages in the southern region and that the northern variety may have multiple origins from these different refugia.
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/1265]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Peng, Xiao-Li,Zhao, Chang-Ming,Wu, Gui-Li,et al. Genetic variation and phylogeographic history of Picea likiangensis revealed by RAPD markers[J]. TREES-STRUCTURE AND FUNCTION, Peng XiaoLi,Zhao ChangMing,Wu GuiLi, Liu JianQuan.Genetic variation and phylogeographic history of Picea likiangensis revealed by RAPD markers.TREES-STRUCTURE AND FUNCTION,2007,21(4):457-464,2007.
APA	Peng, Xiao-Li,Zhao, Chang-Ming,Wu, Gui-Li,&Liu, Jian-Quan.(2007).Genetic variation and phylogeographic history of Picea likiangensis revealed by RAPD markers.TREES-STRUCTURE AND FUNCTION.
MLA	Peng, Xiao-Li,et al."Genetic variation and phylogeographic history of Picea likiangensis revealed by RAPD markers".TREES-STRUCTURE AND FUNCTION (2007).