Genetic structure of the tree peony (Paeonia rockii) and the Qinling Mountains as a geographic barrier driving the fragmentation of a large population

Tree peonies are great ornamental plants associated with a rich ethnobotanical history in Chinese culture and have recently been used as an evolutionary model. The Qinling Mountains represent a significant geographic barrier in Asia, dividing mainland China into northern (temperate) and southern (se...

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Bibliographic Details
Published in:PloS one 2012-04, Vol.7 (4), p.e34955-e34955
Main Authors: Yuan, Jun-hui, Cheng, Fang-Yun, Zhou, Shi-Liang
Format: Article
Language:English
Subjects:
Analysis
Bayes Theorem
Bayesian analysis
Biodiversity
Biogeography
Biology
Breeding
China
Chloroplasts
Conservation
Cultivars
Differentiation
DNA, Plant - genetics
Evolution
Evolution (Biology)
Exploitation
Flora
Flowers & plants
Fragmentation
Gene Flow
Genes
Genetic diversity
Genetic markers
Genetic research
Genetic structure
Genetic Variation - genetics
Genetics, Population
Geography
Germplasm
Homozygosity
Impact factors
Laboratories
Landscape architecture
Microsatellite Repeats
Microsatellites
Morphology
Mountains
Ornamental plants
Paeonia - genetics
Paeonia rockii
Paeoniaceae
Phylogeography
Plant breeding
Plant sciences
Plants (botany)
Population
Population differentiation
Population genetics
Populations
Species diversity
Trees
Wildlife conservation
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Summary:Tree peonies are great ornamental plants associated with a rich ethnobotanical history in Chinese culture and have recently been used as an evolutionary model. The Qinling Mountains represent a significant geographic barrier in Asia, dividing mainland China into northern (temperate) and southern (semi-tropical) regions; however, their flora has not been well analyzed. In this study, the genetic differentiation and genetic structure of Paeonia rockii and the role of the Qinling Mountains as a barrier that has driven intraspecific fragmentation were evaluated using 14 microsatellite markers. Twenty wild populations were sampled from the distributional range of P. rockii. Significant population differentiation was suggested (F(ST) value of 0.302). Moderate genetic diversity at the population level (H(S) of 0.516) and high population diversity at the species level (H(T) of 0.749) were detected. Significant excess homozygosity (F(IS) of 0.076) and recent population bottlenecks were detected in three populations. Bayesian clusters, population genetic trees and principal coordinate analysis all classified the P. rockii populations into three genetic groups and one admixed Wenxian population. An isolation-by-distance model for P. rockii was suggested by Mantel tests (r = 0.6074, P
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0034955