A wild rice CSSL population facilitated identification of salt tolerance genes and rice germplasm innovation

文献类型： 外文期刊

第一作者： Xing, Meng

作者： Xing, Meng;Nie, Yamin;Huang, Jingfen;Wang, Shizhuang;Wang, Yanyan;Chen, Wenxi;Chen, Ziyi;Zhang, Lifang;Cheng, Yunlian;Yang, Qingwen;Sun, Jiaqiang;Qiao, Weihua;Xing, Meng;Nie, Yamin;Huang, Jingfen;Wang, Shizhuang;Wang, Yanyan;Chen, Ziyi;Yang, Qingwen;Qiao, Weihua;Li, Yapeng;Zhao, Mingchao

作者机构：

期刊名称：PHYSIOLOGIA PLANTARUM （ 影响因子：6.4； 五年影响因子：5.9 ）

ISSN： 0031-9317

年卷期： 2024 年 176 卷 2 期

页码：

收录情况： SCI

摘要： Salt stress is one of the major factors that limits rice production. Therefore, identification of salt-tolerant alleles from wild rice is important for rice breeding. In this study, we constructed a set of chromosome segment substitution lines (CSSLs) using wild rice as the donor parent and cultivated rice Nipponbare (Nip) as the recurrent parent. Salt tolerance germinability (STG) was evaluated, and its association with genotypes was determined using this CSSL population. We identified 17 QTLs related to STG. By integrating the transcriptome and genome data, four candidate genes were identified, including the previously reported AGO2 and WRKY53. Compared with Nip, wild rice AGO2 has a structure variation in its promoter region and the expression levels were upregulated under salt treatments; wild rice WRKY53 also has natural variation in its promoter region, and the expression levels were downregulated under salt treatments. Wild rice AGO2 and WRKY53 alleles have combined effects for improving salt tolerance at the germination stage. One CSSL line, CSSL118 that harbors these two alleles was selected. Compared with the background parent Nip, CSSL118 showed comprehensive salt tolerance and higher yield, with improved transcript levels of reactive oxygen species scavenging genes. Our results provided promising genes and germplasm resources for future rice salt tolerance breeding.

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