Genome-wide association study identifies five new cadmium uptake loci in wheat

文献类型： 外文期刊

第一作者： Bin Safdar, Luqman

作者： Bin Safdar, Luqman;Almas, Fakhrah;Sarfraz, Sidra;Ejaz, Muhammad;Mahmood, Zahid;Quraishi, Umar Masood;Bin Safdar, Luqman;Yang, Li;Liu, Shengyi;Ali, Zeshan;Mahmood, Zahid;Tehseen, Muhammad Massub;Ikram, Muhammad

作者机构：

期刊名称：PLANT GENOME （ 影响因子：4.089； 五年影响因子：4.972 ）

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年卷期： 2020 年 13 卷 2 期

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收录情况： SCI

摘要： Cadmium (Cd) toxicity is a serious threat to future food security and health safety. To identify genetic factors contributing to Cd uptake in wheat, we conducted a genome-wide association study with genotyping from 90K SNP array. A spring wheat diversity panel was planted under normal conditions and Cd stress (50 mg Cd/kg soil). The impact of Cd stress on agronomic traits ranged from a reduction of 16% in plant height to 93% in grain iron content. Individual genotypes showed a considerable variation for Cd uptake and translocation subdividing the panel into three groups: (1) hyper-accumulators (i.e. high Leaf(_Cd) and low Seed(_Cd)), (2) hyper-translocators (i.e. low Leaf(_Cd) and high Seed(_Cd)), and (3) moderate lines (i.e. low Leaf(_Cd) and low Seed(_Cd)). Two lines (SKD-1 and TD-1) maintained an optimum grain yield under Cd stress and were therefore considered as Cd resistant lines. Genome-wide association identified 179 SNP-trait associations for various traits including 16 for Cd uptake at a significance level of P < .001. However, only five SNPs were significant after applying multiple testing correction. These loci were associated with seed-cadmium, grain-iron, and grain-zinc: qSCd-1A, qSCd-1D, qZn-2B1, qZn-2B2, and qFe-6D. These five loci had not been identified in the previously reported studies for Cd uptake in wheat. These loci and the underlying genes should be further investigated using molecular biology techniques to identify Cd resistant genes in wheat.

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