数字农科院2.0

Genome-Wide Association Study (Gwas) Reveals Genetic Loci Of Lead (Pb) Tolerance During Seedling Establishment In Rapeseed (Brassica Napus L.)

文献类型： 外文期刊

作者： Zhang, FG; Xiao, X; Xu, K; Cheng, X; Xie, T; Hu, JH; Wu, XM

作者机构：

关键词： Lead (Pb) Tolerance; Phytoremediation; Snp Markers; Gwas; Rapeseed

期刊名称： BMC GENOMICS

ISSN： 1471-2164

年卷期： 2020 年 21 卷 1 期

页码：

收录情况： JCR（2021版）

摘要： BackgroundLead (Pb) pollution in soil has become one of the major environmental threats to plant growth and human health. Safe utilization of Pb contaminated soil by phytoremediation require Pb-tolerant rapeseed (Brassica napus L.) accessions. However, breeding of new B. napus cultivars tolerance to Pb stress has been restricted by limited knowledge on molecular mechanisms involved in Pb tolerance. This work was carried out to identify genetic loci related to Pb tolerance during seedling establishment in rapeseed.ResultsPb tolerance, which was assessed by quantifying radicle length (RL) under 0 or 100mg/L Pb stress condition, shown an extensive variation in 472 worldwide-collected rapeseed accessions. Based on the criterion of relative RL>80%, six Pb-tolerant genotypes were selected. Four quantitative trait loci (QTLs) associated with Pb tolerance were identified by Genome-wide association study. The expression level of nine promising candidate genes, including GSTUs, BCATs, UBP13, TBR and HIPP01, located in these four QTL regions, were significantly higher or induced by Pb in Pb-tolerant accessions in comparison to Pb-sensitive accessions.ConclusionTo our knowledge, this is the first study on Pb-tolerant germplasms and genomic loci in B. napus. The findings can provide valuable genetic resources for the breeding of Pb-tolerant B. napus cultivars and understanding of Pb tolerance mechanism in Brassica species.

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