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QTL mapping and candidate gene analysis of cadmium accumulation in polished rice by genome-wide association study

文献类型： 外文期刊

作者： Pan, Xiaowu 1 ; Li, Yongchao 1 ; Liu, Wenqiang 1 ; Liu, Sanxiong 1 ; Min, Jun 1 ; Xiong, Haibo 1 ; Dong, Zheng 1 ; Duan, 1 ;

作者机构： 1.Hunan Acad Agr Sci, Hunan Rice Res Inst, Changsha 410125, Peoples R China

2.Minist Agr, Key Lab Indica Rice Genet & Breeding Middle & Low, Changsha 410125, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2020 年 10 卷 1 期

页码：

收录情况： SCI

摘要： Cadmium (Cd) accumulation in rice is a serious threat to food safety and human health. Breeding rice varieties with low Cd accumulation is one of the most effective approaches to reducing health risks from Cd-polluted rice. However, the genetic basis of Cd accumulation in grains, especially in indica rice varieties, has not been fully elucidated. The evaluation of Cd-accumulation capacity was conducted among 338 diverse rice accessions grown in Cd-contaminated soils with different Cd contents. Thirteen rice lines with relatively low Cd accumulation, including six indica rice lines, were identified. Then, 35 QTLs significantly associated with Cd accumulation were identified through sequencing-based SNP discovery and a genome-wide association study (GWAS) in the two experimental years, and only qCd8-1 was detected in both years. Among of them, nine QTLs were co-localized with identified genes or QTLs. A novel QTL, qCd1-3, with the lowest P value was selected for further LD decay analysis and candidate gene prediction. We found differential expression of OsABCB24 between high-Cd-accumulative and low-Cd-accumulative accessions, suggesting it may be a candidate gene for qCd1-3 associated with low Cd accumulation. These results may be helpful for further exploiting novel functional genes related to Cd accumulation and developing rice variety with low Cd accumulation through marker-assisted breeding.

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