Document Detail

Inferring multiple refugia and phylogeographical patterns in Pinus massoniana based on nucleotide sequence variation and DNA fingerprinting.
MedLine Citation:
PMID:  22952747     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Pinus massoniana, an ecologically and economically important conifer, is widespread across central and southern mainland China and Taiwan. In this study, we tested the central-marginal paradigm that predicts that the marginal populations tend to be less polymorphic than the central ones in their genetic composition, and examined a founders' effect in the island population.
METHODOLOGY/PRINCIPAL FINDINGS: We examined the phylogeography and population structuring of the P. massoniana based on nucleotide sequences of cpDNA atpB-rbcL intergenic spacer, intron regions of the AdhC2 locus, and microsatellite fingerprints. SAMOVA analysis of nucleotide sequences indicated that most genetic variants resided among geographical regions. High levels of genetic diversity in the marginal populations in the south region, a pattern seemingly contradicting the central-marginal paradigm, and the fixation of private haplotypes in most populations indicate that multiple refugia may have existed over the glacial maxima. STRUCTURE analyses on microsatellites revealed that genetic structure of mainland populations was mediated with recent genetic exchanges mostly via pollen flow, and that the genetic composition in east region was intermixed between south and west regions, a pattern likely shaped by gene introgression and maintenance of ancestral polymorphisms. As expected, the small island population in Taiwan was genetically differentiated from mainland populations.
CONCLUSIONS/SIGNIFICANCE: The marginal populations in south region possessed divergent gene pools, suggesting that the past glaciations might have low impacts on these populations at low latitudes. Estimates of ancestral population sizes interestingly reflect a recent expansion in mainland from a rather smaller population, a pattern that seemingly agrees with the pollen record.
Xue-Jun Ge; Tsai-Wen Hsu; Kuo-Hsiang Hung; Chung-Jian Lin; Chi-Chung Huang; Chao-Ching Huang; Yu-Chung Chiang; Tzen-Yuh Chiang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-08-29
Journal Detail:
Title:  PloS one     Volume:  7     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2012  
Date Detail:
Created Date:  2012-09-06     Completed Date:  2013-02-19     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e43717     Citation Subset:  IM    
Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
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MeSH Terms
Base Sequence
DNA Fingerprinting*
DNA, Plant / genetics*
Genetic Variation*
Haplotypes / genetics
Microsatellite Repeats / genetics
Nucleotides / genetics*
Oceans and Seas
Pinus / classification,  genetics*
Population Density
Reg. No./Substance:
0/DNA, Plant; 0/Nucleotides

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