Patterns of chloroplast DNA variation in Cycas debaoensis (Cycadaceae): conservation implications
Zhan, Qing-Qing1,2; Wang, Jin-Feng1,2; Gong, Xun1; Peng, Hua1
AbstractClimate changes during glacial periods have had significant effects on the current distribution of plant species. Palaeontologial data suggest that modern cycads originated in southwest China. Cycas debaoensis (Cycadaceae) is an endangered species restricted to a small area of southwest China. This species has been classified into two types: sand and karst, according to the soil matrix they grow on. To determine the locations of its glacial refugia and its genetic structure, we examined chloroplast sequence variation of the atpB-rbcL and psbA-trnH intergenic spacers. Four chloroplast DNA haplotypes were obtained from 120 individuals collected from 11 populations covering the entire extant distribution range of the species. Significant population subdivision was detected (G (ST) = 0.684 and F (ST) = 0.74160), suggesting low levels of gene flow between regions and populations. There was marked haplotype differentiation between populations in the sand and karst regions, with only one haplotype being present in both. The molecular phylogenetic data, together with the geographic distribution of the haplotypes, suggest that C. debaoensis experienced range contraction during glacial periods, and that the current populations are still confined to the areas of the original refugia. These results implied that isolated refugia might have maintained in both sand and karst regions during the last glacial maximum and even earlier glaciations. The low within-population diversity of C. debaoensis suggested that there were strong bottleneck events or founder effects within each separate region during the Quaternary climatic oscillations. These findings are important for the conservation of this endangered species.
KeywordChloroplast Dna Atpb-rbcl And Psba-trnh Cycas Debaoensis Glacial Refugia Range Contraction Population Structure Conservation
Subject AreaBiodiversity Conservation ; Genetics & Heredity
Indexed BySCI
WOS IDWOS:000292880800008
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Key Lab Biodivers & Biogeog, Kunming Inst Bot, Kunming 650204, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhan, Qing-Qing,Wang, Jin-Feng,Gong, Xun,et al. Patterns of chloroplast DNA variation in Cycas debaoensis (Cycadaceae): conservation implications[J]. CONSERVATION GENETICS,2011,12(4):959-970.
APA Zhan, Qing-Qing,Wang, Jin-Feng,Gong, Xun,&Peng, Hua.(2011).Patterns of chloroplast DNA variation in Cycas debaoensis (Cycadaceae): conservation implications.CONSERVATION GENETICS,12(4),959-970.
MLA Zhan, Qing-Qing,et al."Patterns of chloroplast DNA variation in Cycas debaoensis (Cycadaceae): conservation implications".CONSERVATION GENETICS 12.4(2011):959-970.
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