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Genome-wide association study reveals the genetic architecture of flowering time in rapeseed (Brassica napus L.)

文献类型： 外文期刊

作者： Xu, Liping 1 ; Hu, Kaining 1 ; Zhang, Zhenqian 2 ; Guan, Chunyun 3 ; Chen, Song; Hua, Wei; Li, Jiana; Wen, Jing; 1 ;

作者机构： 1.Huazhong Agr Univ, Natl Ctr Rapeseed Improvement, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China

2.Hunan Agr Univ, Coll Agron, Changsha 410128, Hunan, Peoples R China

3.Hunan Agr U

关键词： Brassica napus;flowering time;SNP;association mapping;linkage disequilibrium

期刊名称：DNA RESEARCH （ 影响因子：4.458； 五年影响因子：5.371 ）

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收录情况： SCI

摘要： Flowering time adaptation is a major breeding goal in the allopolyploid species Brassica napus. To investigate the genetic architecture of flowering time, a genome-wide association study (GWAS) of flowering time was conducted with a diversity panel comprising 523 B. napus cultivars and inbred lines grown in eight different environments. Genotyping was performed with a Brassica 60K Illumina Infinium SNP array. A total of 41 single-nucleotide polymorphisms (SNPs) distributed on 14 chromosomes were found to be associated with flowering time, and 12 SNPs located in the confidence intervals of quantitative trait loci (QTL) identified in previous researches based on linkage analyses. Twenty-five candidate genes were orthologous to Arabidopsis thaliana flowering genes. To further our understanding of the genetic factors influencing flowering time in different environments, GWAS was performed on two derived traits, environment sensitivity and temperature sensitivity. The most significant SNPs were found near Bn-scaff_16362_1-p380982, just 13 kb away from BnaC09g41990D, which is orthologous to A. thaliana CONSTANS (CO), an important gene in the photoperiod flowering pathway. These results provide new insights into the genetic control of flowering time in B. napus and indicate that GWAS is an effective method by which to reveal natural variations of complex traits in B. napus.

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