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Genome-Wide Association Study Reveals the Genetic Basis of Crude Fiber Components in Brassica napus L. Shoots at Stem Elongation Stage

文献类型： 外文期刊

作者： Shi, Rui 1 ; Cao, Yu 1 ; Yang, Tinghai 1 ; Wang, Yaping 1 ; Xiang, Yanan 1 ; Chen, Feng 1 ; Zhang, Wei 1 ; Zhou, Xiaoying 1 ; Sun, Chengming 1 ; Fu, Sanxiong 1 ; Hu, Maolong 1 ; Zhang, Jiefu 1 ; Wang, Xiaodong 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Minist Agr & Rural Afairs, Inst Ind Crops, Key Lab Cotton & Rapeseed, Nanjing 210014, Peoples R China

2.Oil Crops Res Inst, Chinese Acad Agr Sci, Key Lab Biol & Genet Improvement Oil Crops, Minist Agr & Rural Affairs, Wuhan 430062, Peoples R China

3.Yili Kazakh Autonmoous Prefecture Institure Agr Sc, Yining 835000, Xinjiang, Peoples R China

关键词： Brassica napus; shoots; crudefiber components; GWAS; candidate gene; germplasm resource

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.7； 五年影响因子：6.0 ）

ISSN： 0021-8561

年卷期： 2024 年 72 卷 29 期

页码：

收录情况： SCI

摘要： Brassica napus is currently the principal field crop for producing materials for primary, secondary and tertiary industries. B. napus shoots at stem elongation stage are rich in anthocyanins, vitamin C and mineral elements such as selenium, calcium and zinc, and represent a new type of green vegetable. However, the high crude fiber (CF) content of B. napus shoots affects their taste, and few studies have focused on the quality traits of these vegetables. In this study, we investigated five traits related to the CF components, including neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), hemicellulose (Hem) and cellulose (Cel), of B. napus shoots. Whole-genome resequencing at a depth of similar to 20x was utilized to genotype an association panel of 202 diverse accessions, which resulted in the identification of 6,093,649 single nucleotide polymorphisms (SNPs) and 996,252 indels, respectively. A genome-wide association study (GWAS) was performed for the five CF-related traits based on the phenotypic data observed in four environments. A total of 1,285 significant SNPs were detected at the threshold of -log(10) (p) = 5.16, and 97 significant association regions were obtained. In addition, seven candidate genes located on chromosomes A2 (one gene), A8 (three genes), A9 (two genes) and C9 (one gene) related to CF traits were identified, and ten lines containing low CF contents were selected as excellent germplasm resources for breeding. Our results contributed new insights into the genetic basis of CF traits and suggested germplasm resources for the quality improvement of B. napus shoots.

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