Earliness traits in rapeseed (Brassica napus): SNP loci and candidate genes identified by genome-wide association analysis
文献类型： 外文期刊
作者： Zhou, Qinghong 1 ; Han, Depeng 1 ; Mason, Annaliese S. 2 ; Zhou, Can 1 ; Zheng, Wei 3 ; Li, Yazhen 3 ; Wu, Caijun 1 ; Fu, 1 ;
作者机构： 1.Jiangxi Agr Univ, Agron Coll, Key Lab Crop Physiol Ecol & Genet Breeding, Minist Educ, Nanchang 330045, Jiangxi, Peoples R China
2.Justus Liebig Univ, Plant Breeding Dept, IFZ Res Ctr Biosyst Land Use & Nutr, D-35392 Giessen, Germany
3.Jiangxi Inst Red Soil, Jinxian 331717, Peoples R China
关键词： Brassica napus; genome-wide association study; SNP loci; candidate gene; earliness
期刊名称：DNA RESEARCH （ 影响因子：4.458； 五年影响因子：5.371 ）
ISSN： 1340-2838
年卷期： 2018 年 25 卷 3 期
页码：
收录情况： SCI
摘要： Life cycle timing is critical for yield and productivity of Brassica napus (rapeseed) cultivars grown in different environments. To facilitate breeding for earliness traits in rapeseed, SNP loci and underlying candidate genes associated with the timing of initial flowering, maturity and final flowering, as well as flowering period (FP) were investigated in two environments in a diversity panel comprising 300 B. napus inbred lines. Genome-wide association studies (GWAS) using 201,817 SNP markers previously developed from SLAF-seq (specific locus amplified fragment sequencing) revealed a total of 131 SNPs strongly linked (P < 4.96E-07) to the investigated traits. Of these 131 SNPs, 40 fell into confidence intervals or were physically adjacent to previously published flowering time QTL or SNPs. Phenotypic effect analysis detected 35 elite allelic variants for early maturing, and 90 for long FP. Candidate genes present in the same linkage disequilibrium blocks (r(2) > 0.6) or in 100 kb regions around significant trait-associated SNPs were screened, revealing 57 B. napus genes (33 SNPs) orthologous to 39 Arabidopsis thaliana flowering time genes. These results support the practical and scientific value of novel large-scale SNP data generation in uncovering the genetic control of agronomic traits in B. napus, and also provide a theoretical basis for molecular marker-assisted selection of earliness breeding in rapeseed.
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