Whole-Genome Sequence of Synthesized Allopolyploids in Cucumis Reveals Insights into the Genome Evolution of Allopolyploidization

文献类型： 外文期刊

第一作者： Yu, Xiaqing

作者： Yu, Xiaqing;Wang, Panqiao;Li, Ji;Zhao, Qinzheng;Zhu, Zaobing;Zhai, Yufei;Qin, Xiaodong;Cheng, Chunyan;Lou, Qunfeng;Chen, Jinfeng;Li, Ji;Li, Ji;Yu, Haiyan;Cheng, Xinchao;Zhou, Junguo;Isshiki, Shiro;Jahn, Molly;Doyle, Jeff J.;Ottosen, Carl-Otto;Bai, Yuling;Cai, Qinsheng;Huang, Sanwen

作者机构：

关键词： allopolyploidy; Cucumis; diploidization; evolution; genomes

期刊名称：ADVANCED SCIENCE （ 影响因子：16.806； 五年影响因子：17.835 ）

ISSN：

年卷期： 2021 年 8 卷 9 期

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收录情况： SCI

摘要： The importance of allopolyploidy in plant evolution has been widely recognized. The genetic changes triggered by allopolyploidy, however, are not yet fully understood due to inconsistent phenomena reported across diverse species. The construction of synthetic polyploids offers a controlled approach to systematically reveal genomic changes that occur during the process of polyploidy. This study reports the first fully sequenced synthetic allopolyploid constructed from a cross between Cucumis sativus and C. hystrix, with high-quality assembly. The two subgenomes are confidently partitioned and the C. sativus-originated subgenome predominates over the C. hystrix-originated subgenome, retaining more sequences and showing higher homeologous gene expression. Most of the genomic changes emerge immediately after interspecific hybridization. Analysis of a series of genome sequences from several generations (S-0, S-4-S-13) of C. xhytivus confirms that genomic changes occurred in the very first generations, subsequently slowing down as the process of diploidization is initiated. The duplicated genome of the allopolyploid with double genes from both parents broadens the genetic base of C. xhytivus, resulting in enhanced phenotypic plasticity. This study provides novel insights into plant polyploid genome evolution and demonstrates a promising strategy for the development of a wide array of novel plant species and varieties through artificial polyploidization.

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