Geographic variation of chloroplast DNA in Platycarya strobilacea (Juglandaceae)

The monotypic genus Platycarya (Juglandaceae) is one of the most widespread temperate tree species in East Asia. In this research, we implemented a phylogeographical study using chloroplast DNA (cpDNA) (psbA-trnH and atpB-rbcL intergenic spacer) sequences on Platyearya strobilacea, in order to ident...

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Veröffentlicht in:植物分类学报:英文版 2012, Vol.50 (4), p.374-385
1. Verfasser: Shi-Chao CHEN Li ZHANG jie ZENG Fei SHI Hong YANG yun-Rui MAO Cheng-Xin FU
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description The monotypic genus Platycarya (Juglandaceae) is one of the most widespread temperate tree species in East Asia. In this research, we implemented a phylogeographical study using chloroplast DNA (cpDNA) (psbA-trnH and atpB-rbcL intergenic spacer) sequences on Platyearya strobilacea, in order to identify the locations of the species' main refugia and migration routes. A total of 180 individuals of P stobilacea from 27 populations from China and Jeju Island (Korea) were collected. The results revealed that P strobilacea had 35 haplotypes for the two intergenic spacers and high genetic diversity (hT - 0.926). This surprisingly high diversity ofhaplotypes indicates its long evolutionary history, which is in agreement with previous phylogenetic analyses and fossil records. Significant cpDNA population subdivision was detected (GsT = 0.720; NsT = 0.862), suggesting low levels of recurrent gene flow through seeds among populations and significant phylogeographical structure (NsT 〉 GsT, P 〈 0.05). The construction of phylogenetic relationships of the 35 chlorotypes detected four major cpDNA clades. Divergence dating analyses using BEAST suggest that the divergence of the major cpDNA clades occurred before the Miocene. Demographic analysis indicated that the Eastern clade underwent localized demographic expansions. The molecular phylogenetic data, together with the geographic distribution of the haplotypes, suggest the existence of multiple glacial refugia in most of its current range in China through Quaternary climatic oscillations.
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In this research, we implemented a phylogeographical study using chloroplast DNA (cpDNA) (psbA-trnH and atpB-rbcL intergenic spacer) sequences on Platyearya strobilacea, in order to identify the locations of the species' main refugia and migration routes. A total of 180 individuals of P stobilacea from 27 populations from China and Jeju Island (Korea) were collected. The results revealed that P strobilacea had 35 haplotypes for the two intergenic spacers and high genetic diversity (hT - 0.926). This surprisingly high diversity ofhaplotypes indicates its long evolutionary history, which is in agreement with previous phylogenetic analyses and fossil records. Significant cpDNA population subdivision was detected (GsT = 0.720; NsT = 0.862), suggesting low levels of recurrent gene flow through seeds among populations and significant phylogeographical structure (NsT 〉 GsT, P 〈 0.05). The construction of phylogenetic relationships of the 35 chlorotypes detected four major cpDNA clades. Divergence dating analyses using BEAST suggest that the divergence of the major cpDNA clades occurred before the Miocene. Demographic analysis indicated that the Eastern clade underwent localized demographic expansions. 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subjects 化香
叶绿体DNA
叶绿体基因组
地理变异
基因间隔区
系统发育分析
胡桃
遗传多样性
title Geographic variation of chloroplast DNA in Platycarya strobilacea (Juglandaceae)
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