文献类型： 外文期刊
作者： Wu, Jun 1 ; Wang, Yingtao 2 ; Xu, Jiabao 3 ; Korban, Schuyler S. 4 ; Fei, Zhangjun 5 ; Tao, Shutian 1 ; Ming, Ray 4 ; Tai 1 ;
作者机构： 1.Nanjing Agr Univ, Ctr Pear Engn Technol Res, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Jiangsu, Peoples R China
2.Hebei Acad Agr & Forestry Sci, Shijiazhuang Fruit Tree Res Inst, Shijiazhuang 050061, Hebei, Peoples R China
3.BGI Shenzhen, BGI Genom, Shenzhen 518083, Peoples R China
4.Univ Illinois, Urbana, IL 61801 USA
5.Cornell Univ, Plant Pathol & Plant Microbe Sect, Geneva, NY 14853 USA
6.USDA ARS, Boyce Thompson Inst, Ithaca, NY 14853 USA
7.Fujian Agr & Forestry Univ, Fuzhou 350002, Fujian, Peoples R China
8.USDA ARS, Natl Clonal Germplasm Repository, Corvallis, OR 97333 USA
9.New Zealand Inst Plant Food Res Ltd, Auckland, New Zealand
10.James D Watson Inst Genome Sci, Hangzhou 310058, Zhejiang, Peoples R China
关键词： Pear (Pyrus); Re-sequencing genomes; Origin and evolution; Independent domestication; Fruit-related traits; Self-incompatibility
期刊名称：GENOME BIOLOGY （ 影响因子：13.583； 五年影响因子：17.433 ）
ISSN： 1474-760X
年卷期： 2018 年 19 卷
页码：
收录情况： SCI
摘要： Background: Pear (Pyrus) is a globally grown fruit, with thousands of cultivars in five domesticated species and dozens of wild species. However, little is known about the evolutionary history of these pear species and what has contributed to the distinct phenotypic traits between Asian pears and European pears. Results: We report the genome resequencing of 113 pear accessions from worldwide collections, representing both cultivated and wild pear species. Based on 18,302,883 identified SNPs, we conduct phylogenetics, population structure, gene flow, and selective sweep analyses. Furthermore, we propose a model for the divergence, dissemination, and independent domestication of Asian and European pears in which pear, after originating in southwest China and then being disseminated throughout central Asia, has eventually spread to western Asia, and then on to Europe. We find evidence for rapid evolution and balancing selection for S-RNase genes that have contributed to the maintenance of self-incompatibility, thus promoting outcrossing and accounting for pear genome diversity across the Eurasian continent. In addition, separate selective sweep signatures between Asian pears and European pears, combined with co-localized QTLs and differentially expressed genes, underline distinct phenotypic fruit traits, including flesh texture, sugar, acidity, aroma, and stone cells. Conclusions: This study provides further clarification of the evolutionary history of pear along with independent domestication of Asian and European pears. Furthermore, it provides substantive and valuable genomic resources that will significantly advance pear improvement and molecular breeding efforts.
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