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Retrotransposon-based sequence-specific amplification polymorphism markers reveal that cultivated Pyrus ussuriensis originated from an interspecific hybridization

文献类型： 外文期刊

作者： Yu, Peiyuan 1 ; Jiang, Shuang 2 ; Wang, Xiaoxiang 3 ; Bai, Songling 1 ; Teng, Yuanwen 1 ;

作者机构： 1.Zhejiang Univ, Dept Hort, State Agr Minist, Key Lab Hort Plant Growth Dev & Qual Improvement, Hangzhou 310058, Zhejiang, Peoples R China

2.Shanghai Acad Agr Sci, Forest & Fruit Inst 3, Shanghai 201403, Peoples R China

3.Heilongjiang Acad Agr Sci, Hort Sub Acad, Harbin 150069, Heilongjiang, Peoples R China

关键词： hybridization origin;SSAP markers;Ussurian pear;Pyrus pyrifolia;genetic diversity;genetic structure;domestication

期刊名称：EUROPEAN JOURNAL OF HORTICULTURAL SCIENCE （ 影响因子：1.482； 五年影响因子：1.503 ）

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收录情况： SCI

摘要： Pyrus ussuriensis Maxim. cultivars have long been considered to be directly derived from wild P. ussuriensis, which is distributed in northeastern China. However, recent studies have revealed that P us-, suriensis cultivars are similar to Pyrus pyrifolia, which is extensively cultivated in China. To clarify the origin of cultivated P ussuriensis, 12 primers of retrotransposon-based sequence-specific amplification polymorphism marker were used to analyze the genetic relationships among 92 Pyrus accessions, including cultivated P pyrifolia, cultivated and wild P ussuriensis, and a few Occidental species. We obtained 1,143 scorable fragments using 12 primer combinations, of which 871 were polymorphic (i.e., 76.20%). A dendrogram produced using Dice similarity coefficients and the unweighted pair group method with arithmetic mean indicated that wild and cultivated P. ussuriensis form a group parallel to the P. pyrifolia group, in which a few P. ussuriensis cultivars are scattered and further divided into independent subgroups. A Bayesian model-based analysis of population structures revealed that P ussuriensis cultivars consist of two major genepools, with one originating from wild P. ussuriensis and the other from cultivated P. pyrifolia. Our results suggest that cultivated P ussuriensis originated from an interspecific hybridization between P. ussuriensis and P pyrifolia. Our findings not only provide new insights into the origin of cultivated P. ussuriensis, but may contribute to the improvement of P ussuriensis cultivars.

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