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| GWAS and Coexpression Network Combination Uncovers Effect Loci in the Accumulation of Glucosinolates Content in Brassica napus |
| LIU Wei1, YAO Ming1, KANG Yu1, WANG Mei1, XIE Pan1, HE Xin1, LIU Zhong-Song1, GUAN Chun-Yun1, QIAN Wei3, HUA Wei2, QIAN Lun-Wen1,* |
1 Collaborative Innovation Center of Grain and Oil Crops in South China, Hunan Agricultural University, Changsha 410128, China;
2 Key Laboratory for Biological Sciences of Oil Crops Ministry of Agriculture/Oil Crops Research Institute, Chinese Academy of Agriculture Sciences, Wuhan 430062, China;
3 College of Agronomy and Biotechnology, Southwest University, Chongqing 400716, China |
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Abstract Reducing the content of seed glucosinolates (GSL) has a positive impact on the seed quality of Brassica napus. In this study, genome-wide association study (GWAS) of seed GSL content was performed by using the 60K Brassica infinium single nucleotide polymorphism (SNP) array in 203 oilseed rape accessions. A total of 20 SNPs were detected significant associated with GSL content and located on the A02, A03, A09, C03, C08, and C09 chromosomes. A linkage disequilibrium analysis was performed on flanking sequence of these significantly associated SNP loci, and a haplotype region (57830409~58283210 bp; r2 = 0.96) was detected significantly associated with GSL content on the C03 chromosome. This haplotype region carrying an orthologues of Arabidopsis gene BCAT4 (branched-chain aminotransferase 4) was involved in GSL biosynthesis process. Based on the above results, regional association analysis revealed BnBCAT4-C03(BnaC03g68450D) gene region structural variation effected the accumulation of GSL in this haplotype region by genome-wide resequencing data of 50 accessions. Meanwhile,co-expression network analysis suggested BnBCAT4-C03 gene relationship with genes in the pathway of glucosinolates synthesis that formed molecular networks regulation in the synthesis and accumulation of GSL content. Our results would be benefit for the development of haplotype functional markers to further reduce GSL content in rapeseed.
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Received: 03 February 2019
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Corresponding Authors:
qianlunwen@163.com
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