数字农科院2.0

Genome-wide association study using an aus Rice panel identifies a Salinity Sensitive Gene on Chromosome 6 at seedling stage

文献类型： 外文期刊

作者： Hu, Shiqin;Chen, Yuetong;Zhao, Qing;Zou, Wenli;Wang, Xiwei;Meng, Lijun;Liu, Changhua;Ye, Guoyou

作者机构：

关键词： Aus;DUF1645;GWAS;OsSS6;Rice;Salt tolerance

期刊名称： INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

ISSN： 0141-8130

年卷期： 2025 年 338 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Rice is one of the most important food crops worldwide, and high salinity causes significant losses in productivity. Here, we performed a genome-wide association study (GWAS) using 163 aus accessions to identify seedling-stage salt tolerance-related QTLs and candidate genes. A total of five QTLs were identified, with qSES6.1 (chromosome 6) demonstrating the strongest association with Standard Evalution Score (SES) of salt tolerance. Further analysis identified LOC_Os06g11150 as a function gene for qSES6.1. We named it as Salinity Sensitive Gene on Chromosome 6 (OsSS6). OsSS6 was localized to the plasma membrane and encoded a DUF1645 domain containing protein. The OsSS6 mutants generated by CRISPR/Cas9 significantly enhanced salt tolerance at the seedlings stage as measured by SES, relative shoot dry weight, relative root dry weight, Na+ contents in shoots and roots and Na+/K+ ratio, indicating that it acts as a negative regulator of salt tolerance. In the mutants of OsSS6, several well-characterized salt tolerance genes-including transporters, ROS scavenging and proline synthesis were significantly up-regulated, implying OsSS6 may affect salt tolerance by effecting on other genes conferring tolerance. The Hap1 in the aus panel might be a desirable haplotype, and haplotype analysis of the 3 K rice resequencing population revealed clear indica-japonica differentiation.

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