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Identifying the Quantitative Trait Locus and Candidate Genes of Traits Related to Milling Quality in Rice via a Genome-Wide Association Study

文献类型： 外文期刊

作者： Hu, Changmin 1 ; Li, Xinru 1 ; Zhang, Mengyuan 1 ; Jing, Chunyu 1 ; Hai, Mei 1 ; Shen, Jiaming 1 ; Xu, Qing 2 ; Dang, Xiaojing 2 ; Shi, Yingyao 1 ; Liu, Erbao 1 ; Jiang, Jianhua 2 ;

作者机构： 1.Anhui Agr Univ, Coll Agron, Hefei 230036, Peoples R China

2.Anhui Acad Agr Sci, Inst Rice Res, Hefei 230031, Peoples R China

关键词： rice; milling quality; genome-wide association study; quantitative trait loci; candidate gene

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

ISSN： 2223-7747

年卷期： 2024 年 13 卷 10 期

页码：

收录情况： SCI

摘要： Milling quality directly affects production efficiency in rice, which is closely related to the brown rice recovery (BRR), the milled rice recovery (MRR) and the head milled rice recovery (HMRR). The present study investigated these three traits in 173 germplasms in two environments, finding abundant phenotypic variation. Three QTLs for BRR, two for MRR, and three for HMRR were identified in a genome-wide association study, five of these were identified in previously reported QTLs and three were newly identified. By combining the linkage disequilibrium (LD) analyses, the candidate gene LOC_Os05g08350 was identified. It had two haplotypes with significant differences and Hap 2 increased the BRR by 4.40%. The results of the qRT-PCR showed that the expression of LOC_Os05g08350 in small-BRR accessions was significantly higher than that in large-BRR accessions at Stages 4-5 of young panicle development, reaching the maximum value at Stage 5. The increase in thickness of the spikelet hulls of the accession carrying LOC_Os05g08350TT occurred due to an increase in the cell width and the cell numbers in cross-sections of spikelet hulls. These results help to further clarify the molecular genetic mechanism of milling-quality-related traits and provide genetic germplasm materials for high-quality breeding in rice.

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