Genomic insights into divergence and dual domestication of cultivated allotetraploid cottons

文献类型： 外文期刊

第一作者： Lei Fang;;Hao Gong;;Yan Hu;;Chunxiao Liu

作者： Lei Fang;Hao Gong;Yan Hu;Chunxiao Liu;Huang, Xuehui;Zhang, Tianzhen;Baoliang Zhou;Tao Huang;Yangkun Wang;Shuqi Chen;David D. Fang;Xiongming Du;Hong Chen;Jiedan Chen;Sen Wang;Qiong Wang;Qun Wan;Bingliang Liu;Mengqiao Pan;Lijing Chang;Huaitong Wu;Gaofu Mei;Dan Xiang;Xinghe Li;Caiping Cai;Xiefei Zhu;Z. Jeffrey Chen;Bin Han;Xiaoya Chen;Wangzhen Guo;Tianzhen Zhang;Xuehui Huang

作者机构：

关键词： Allotetraploid cottons;Resequencing;Divergence;Domestication

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： 2017 年 18 卷

页码：

收录情况： SCI

摘要： Background: Cotton has been cultivated and used to make fabrics for at least 7000 years. Two allotetraploid species of great commercial importance, Gossypium hirsutum and Gossypium barbadense, were domesticated after polyploidization and are cultivated worldwide. Although the overall genetic diversity between these two cultivated species has been studied with limited accessions, their population structure and genetic variations remain largely unknown. Results: We resequence the genomes of 147 cotton accessions, including diverse wild relatives, landraces, and modern cultivars, and construct a comprehensive variation map to provide genomic insights into the divergence and dual domestication of these two important cultivated tetraploid cotton species. Phylogenetic analysis shows two divergent groups for G. hirsutum and G. barbadense, suggesting a dual domestication processes in tetraploid cottons. In spite of the strong genetic divergence, a small number of interspecific reciprocal introgression events are found between these species and the introgression pattern is significantly biased towards the gene flow from G. hirsutum into G. barbadense. We identify selective sweeps, some of which are associated with relatively highly expressed genes for fiber development and seed germination. Conclusions: We report a comprehensive analysis of the evolution and domestication history of allotetraploid cottons based on the whole genomic variation between G. hirsutum and G. barbadense and between wild accessions and modern cultivars. These results provide genomic bases for improving cotton production and for further evolution analysis of polyploid crops.

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