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Resequencing of 414 cultivated and wild watermelon accessions identifies selection for fruit quality traits

文献类型： 外文期刊

作者： Guo, Shaogui 1 ; Zhao, Shengjie 2 ; Sun, Honghe 1 ; Wang, Xin 3 ; Wu, Shan 3 ; Lin, Tao 4 ; Ren, Yi 1 ; Gao, Lei 3 ; Deng, Y 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Natl Watermelon & Melon Improvement Ctr, Key Lab Biol & Genet Improvement Hort Crops North, Beijing Key Lab Vegetable Germplasm Improvement, Beijing, Peoples R China

2.Chinese Acad Agr Sci, Zhengzhou Fruit Res Inst, Zhengzhou, Henan, Peoples R China

3.Cornell Univ, Boyce Thompson Inst Plant Res, Ithaca, NY 14850 USA

4.Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Minist Agr, Genome Anal Lab,Lingnan Guangdong Lab Modern Agr, Shenzhen, Peoples R China

5.USDA ARS, Plant Genet Resources Conservat Unit, Griffin, GA USA

6.USDA ARS, US Vegetable Lab, Charleston, SC USA

7.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Sino Dutch Joint Lab Hort Genom, Key Lab Biol & Genet Improvement Hort Crops,Minis, Beijing, Peoples R China

8.USDA ARS, Robert W Holley Ctr Agr & Hlth, Ithaca, NY 14853 USA

期刊名称：NATURE GENETICS （ 影响因子：38.33； 五年影响因子：36.431 ）

ISSN： 1061-4036

年卷期： 2019 年 51 卷 11 期

页码：

收录情况： SCI

摘要： Fruit characteristics of sweet watermelon are largely the result of human selection. Here we report an improved watermelon reference genome and whole-genome resequencing of 414 accessions representing all extant species in the Citrullus genus. Population genomic analyses reveal the evolutionary history of Citrullus, suggesting independent evolutions in Citrullus amarus and the lineage containing Citrullus lanatus and Citrullus mucosospermus. Our findings indicate that different loci affecting watermelon fruit size have been under selection during speciation, domestication and improvement. A non-bitter allele, arising in the progenitor of sweet watermelon, is largely fixed in C. lanatus. Selection for flesh sweetness started in the progenitor of C. lanatus and continues through modern breeding on loci controlling raffinose catabolism and sugar transport. Fruit flesh coloration and sugar accumulation might have co-evolved through shared genetic components including a sugar transporter gene. This study provides valuable genomic resources and sheds light on watermelon speciation and breeding history.

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