Primitive Genepools of Asian Pears and Their Complex Hybrid Origins Inferred from Fluorescent Sequence-Specific Amplification Polymorphism (SSAP) Markers Based on LTR Retrotransposons

Recent evidence indicated that interspecific hybridization was the major mode of evolution in Pyrus. The genetic relationships and origins of the Asian pear are still unclear because of frequent hybrid events, fast radial evolution, and lack of informative data. Here, we developed fluorescent sequen...

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Bibliographic Details
Published in:PloS one 2016-02, Vol.11 (2), p.e0149192-e0149192
Main Authors: Jiang, Shuang, Zheng, Xiaoyan, Yu, Peiyuan, Yue, Xiaoyan, Ahmed, Maqsood, Cai, Danying, Teng, Yuanwen
Format: Article
Language:English
Subjects:
Amplification
Analysis
Asia
Biological evolution
Biology and Life Sciences
Cultivars
Deoxyribonucleic acid
Distribution
DNA
DNA, Plant - genetics
Domestication
Evolution
Fluorescence
Genetic aspects
Genetic diversity
Genomes
Germplasm
Horticulture
Hybridization
Hybrids
Interspecific
Interspecific hybridization
Laboratories
Markers
Origins
Pears
People and Places
Phylogenetics
Phylogeny
Phylogeography
Polymorphism
Polymorphism, Genetic
Population
Population structure
Pyrus
Pyrus - genetics
Pyrus betulaefolia
Pyrus calleryana
Pyrus hondoensis
Pyrus hopeiensis
Pyrus pashia
Pyrus phaeocarpa
Pyrus pyrifolia
Pyrus sinkiangensis
Pyrus ussuriensis
Pyrus xerophila
Quality
Research and analysis methods
Retroelements
Species
Structural analysis
Studies
Transposons
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Summary:Recent evidence indicated that interspecific hybridization was the major mode of evolution in Pyrus. The genetic relationships and origins of the Asian pear are still unclear because of frequent hybrid events, fast radial evolution, and lack of informative data. Here, we developed fluorescent sequence-specific amplification polymorphism (SSAP) markers with lots of informative sites and high polymorphism to analyze the population structure among 93 pear accessions, including nearly all species native to Asia. Results of a population structure analysis indicated that nearly all Asian pear species experienced hybridization, and originated from five primitive genepools. Four genepools corresponded to four primary Asian species: P. betulaefolia, P. pashia, P. pyrifolia, and P. ussuriensis. However, cultivars of P. ussuriensis were not monophyletic and introgression occurred from P. pyrifolia. The specific genepool detected in putative hybrids between occidental and oriental pears might be from occidental pears. The remaining species, including P. calleryana, P. xerophila, P. sinkiangensis, P. phaeocarpa, P. hondoensis, and P. hopeiensis in Asia, were inferred to be of hybrid origins and their possible genepools were identified. This study will be of great help for understanding the origin and evolution of Asian pears.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0149192