数字农科院2.0

Concurrent Disruption of Genetic Interference and Increase of Genetic Recombination Frequency in Hybrid Rice Using CRISPR/Cas9

文献类型： 外文期刊

作者： Chaolei Liu;Yiwei Cao;Yufeng Hua;Guijie Du;Qing Liu;Xin Wei;Tingting Sun;Jianrong Lin;Mingguo Wu;Zhukuan Cheng;Kejian Wang

作者机构：

关键词： genetic diversity;genetic interference;genetic recombination;genome editing;hybrid rice;synaptonemal complex;ZEP1

期刊名称： Frontiers in Plant Science

ISSN： 1664-462X

年卷期： 2021 年 12.0 卷

页码：

收录情况： JCR（2021版）

摘要： Manipulation of the distribution and frequency of meiotic recombination events to increase genetic diversity and disrupting genetic interference are long-standing goals in crop breeding. However, attenuation of genetic interference is usually accompanied by a reduction in recombination frequency and subsequent loss of plant fertility. In the present study, we generated null mutants of the ZEP1 gene, which encodes the central component of the meiotic synaptonemal complex (SC), in a hybrid rice using CRISPR/Cas9. The null mutants exhibited absolute male sterility but maintained nearly unaffected female fertility. By pollinating the zep1 null mutants with pollen from indica rice variety 93-11, we successfully conducted genetic analysis and found that genetic recombination frequency was greatly increased and genetic interference was completely eliminated in the absence of ZEP1. The findings provided direct evidence to support the controversial hypothesis that SC is involved in mediating interference. Additionally, the remained female fertility of the null mutants makes it possible to break linkage drag. Our study provides a potential approach to increase genetic diversity and fully eliminate genetic interference in rice breeding.

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