Whole-Genome Sequence of Synthesized Allopolyploids in Cucumis Reveals Insights into the Genome Evolution of Allopolyploidization
文献类型： 外文期刊
作者： Yu, Xiaqing 1 ; Wang, Panqiao 1 ; Li, Ji 1 ; Zhao, Qinzheng 1 ; Ji, Changmian 1 ; Zhu, Zaobing 1 ; Zhai, Yufei 1 ; Qin, X 1 ;
作者机构： 1.Nanjing Agr Univ, Natl Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Peoples R China
2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Hainan Key Lab Biosafety Monitoring & Mol Breedin, Haikou 571101, Hainan, Peoples R China
3.Biomarker Technol, Beijing 101300, Peoples R China
4.Henan Inst Sci & Technol, Coll Hort & Landscape, Xinxiang 453000, Henan, Peoples R China
5.Saga Univ, Fac Agr, Saga 8408502, Japan
6.USDA FPL, Jahn Res Grp, Madison, WI 53726 USA
7.Cornell Univ, Sch Integrated Plant Sci, Sect Plant Breeding & Genet, Ithaca, NY 14853 USA
8.Aarhus Univ, Dept Food Sci, DK-8200 Aarhus, Denmark
9.Wageningen Univ & Res, Dept Plant Sci, NL-6700 AJ Wageningen, Netherlands
10.Nanjing Agr Univ, Coll Life Sci, Nanjing 210095, Peoples R China
11.Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Shenzhen 518124, Peoples R China
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
页码：
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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