您好，欢迎访问四川省农业科学院 机构知识库！

Allopolyploidization increases genetic recombination in the ancestral diploid D genome during wheat evolution

文献类型： 外文期刊

作者： Wan, Hongshen 1 ; Li, Jun 1 ; Ma, Shengwei 3 ; Yang, Fan 4 ; Chai, Liang 1 ; Liu, Zehou 1 ; Wang, Qin 1 ; Pu, Zongjun 1 ; Yang, Wuyun 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Sichuan, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab Wheat Biol & Genet Improvement Southwester, Chengdu 610066, Sichuan, Peoples R China

3.Nanjing Agr Univ, Coll Agr Sci, Appl Plant Genom Lab, Nanjing 210095, Jiangsu, Peoples R China

4.Sichuan Agr Univ, Triticeae Res Inst, Chengdu 611130, Sichuan, Peoples R China

关键词： Synthetic wheat; Hexaploidization; Diploid D genome; Genetic recombination; Acceleration of evolution

期刊名称：CROP JOURNAL （ 影响因子：4.647； 五年影响因子：5.781 ）

ISSN： 2095-5421

年卷期： 2022 年 10 卷 3 期

页码：

收录情况： SCI

摘要： Genetic recombination produces new allelic combinations, thereby introducing variation for domestica-tion. Allopolyploidization has increased the evolutionary potential of hexaploid common wheat by con-ferring the advantages of heterosis and gene redundancy, but whether a relationship exists between allopolyploidization and genetic recombination is currently unknown. To study the impact of allopoly-ploidization on genetic recombination in the ancestral D genome of wheat, we generated new synthetic hexaploid wheats by crossing tetraploid Triticum turgidum with multiple diploid Aegilops tauschii acces-sions, with subsequent chromosome doubling, to simulate the evolutionary hexaploidization process. Using the DArT-Seq approach, we determined the genotypes of two new synthetic hexaploid wheats with their parents, F-2 plants in a diploid population (2x, D1D1 x D2D2) and its new synthetic hexaploid wheat-derived population (6x, AABBD(1)D(1) x AABBD(2)D(2)). About 11% of detected SNP loci spanning the D genome of Ae. tauschii were eliminated after allohexaploidization, and the degree of segregation distortion was increased in their hexaploid offspring from the F-2 generation. Based on codominant genotypes, the mean genetic interval length and recombination frequency between pairs of adjacent and linked SNPs on D gen-ome of the hexaploid F-2 population were 2.3 fold greater than those in the diploid F-2 population, and the recombination frequency of Ae. tauschii was increased by their hexaploidization with T. turgidum. In con-clusion, allopolyploidization increases genetic recombination of the ancestral diploid D genome of wheat, and DNA elimination and increased segregation distortion also occur after allopolyploidization. Increased genetic recombination could have produced more new allelic combinations subject to natural or artificial selection, helping wheat to spread rapidly to become a major global crop and thereby accelerating the evolution of wheat via hexaploidization. (C) 2021 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：四川省农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台