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Pentaploidization Enriches the Genetic Diversity of Wheat by Enhancing the Recombination of AB Genomes

文献类型： 外文期刊

作者： Yang, Fan 1 ; Wan, Hongshen 2 ; Li, Jun 2 ; Wang, Qin 2 ; Yang, Ning 2 ; Zhu, Xinguo 2 ; Liu, Zehou 2 ; Yang, Yumin 3 ; Ma, Wujun 4 ; Fan, Xing 1 ; Yang, Wuyun 2 ; Zhou, Yonghong 1 ;

作者机构： 1.Sichuan Agr Univ, Triticeae Res Inst, Chengdu, Peoples R China

2.Sichuan Acad Agr Sci, Crop Res Inst, Key Lab Wheat Biol & Genet Improvement Southwester, Minist Agr & Rural Affairs PRC, Chengdu, Peoples R China

3.Sichuan Acad Agr Sci, Inst Agr Resources & Environm, Chengdu, Peoples R China

4.Murdoch Univ, Coll Sci Hlth Engn & Educ, Australia China Joint Ctr Wheat Improvement, Perth, WA, Australia

关键词： pentaploid; chromosome recombination; linkage drag; genetic bottleneck; adaptive evolution

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Allohexaploidization and continuous introgression play a key role in the origin and evolution of bread wheat. The genetic bottleneck of bread wheat resulting from limited germplasms involved in the origin and modern breeding may be compensated by gene flow from tetraploid wheat through introgressive hybridization. The inter-ploidy hybridization between hexaploid and tetraploid wheat generates pentaploid hybrids first, which absorbed genetic variations both from hexaploid and tetraploid wheat and have great potential for re-evolution and improvement in bread wheat. Therefore, understanding the effects of the pentaploid hybrid is of apparent significance in our understanding of the historic introgression and in informing breeding. In the current study, two sets of F-2 populations of synthetic pentaploid wheat (SPW1 and SPW2) and synthetic hexaploid wheat (SHW1 and SHW2) were created to analyze differences in recombination frequency (RF) of AB genomes and distorted segregation of polymorphic SNP markers through SNP genotyping. Results suggested that (1) the recombination of AB genomes in the SPW populations was about 3- to 4-fold higher than that in the SHW populations, resulting from the significantly (P < 0.01) increased RF between adjacent and linked SNP loci, especially the variations that occurred in a pericentromeric region which would further enrich genetic diversity; (2) the crosses of hexaploid x tetraploid wheat could be an efficient way to produce pentaploid derivatives than the crosses of tetraploid x hexaploid wheat according to the higher germination rate found in the former crosses; (3) the high proportion of distorted segregation loci that skewed in favor of the female parent genotype/allele in the SPW populations might associate with the fitness and survival of the offspring. Based on the presented data, we propose that pentaploid hybrids should increasingly be used in wheat breeding. In addition, the contribution of gene flow from tetraploid wheat to bread wheat mediated by pentaploid introgressive hybridization also was discussed in the re-evolution of bread wheat.

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