The Identification of Drought Tolerance Candidate Genes in <i>Oryza sativa</i> L. ssp. <i>Japonica</i> Seedlings through Genome-Wide Association Study and Linkage Mapping
2024
Tao Liu | Shuangshuang Li | Haoqiang Du | Jingnan Cui | Shanbin Xu | Jingguo Wang | Hualong Liu | Detang Zou | Wenhe Lu | Hongliang Zheng
Drought stress poses a significant threat to rice production, necessitating the identification of genes associated with drought tolerance. This study employed a combination of genome-wide association study (GWAS) and linkage mapping to pinpoint seedling drought tolerance genes in <i>Japonica</i> rice. Using the leaf rolling scale (LRS) as the phenotypic index, we assessed rice drought tolerance under polyethylene glycol-induced drought during the seedling stage. A lead SNP C8_28933410 by GWAS was identified, which was located within <i>qLRS-8-1</i> identified by linkage mapping on chromosome 8. Combing the LD block analyses and QTL interval, a 138.6 kb overlap interval was considered as the candidate region. Haplotype analysis, qRT-PCR, sequence analysis, and mutant phenotype verification led to the speculation that <i>LOC_Os08g05520</i> is a candidate gene associated with drought tolerance. Our findings provide a valuable reference for breeders aiming to enhance rice drought tolerance.
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