|Identification of quantitative trait loci and candidate genes controlling seed pigments of rapeseed
ZHU Mei-chen1*, HU Ran1*, ZHAO Hui-yan1, TANG Yun-shan1, SHI Xiang-tian1, JIANG Hai-yan1, ZHANG Zhi-yuan1, FU Fu-you2, XU Xin-fu1, TANG Zhang-lin1, LIU Lie-zhao1, LU Kun1, LI Jia-na1, QU Cun-min1
1 Chongqing Engineering Research Center for Rapeseed/College of Agronomy and Biotechnology, Southwest University/Academy of Agricultural Sciences, Southwest University, Chongqing 400716, P.R.China
2 Agriculture and Agri-Food Canada, Saskatoon Research Centre, Saskatoon S7N02X, Canada
Rapeseed (Brassica napus L.) is an important source of edible vegetable oil and feed protein; however, seed pigments affect the quality of rapeseed oil and the feed value of the residue from oil pressing. Here, we used a population of rapeseed recombinant inbred lines (RILs) derived from the black-seeded male parent cultivar Zhongyou 821 and the yellow-seeded female parent line GH06 to map candidate genes controlling seed pigments in embryos and the seed coat. We detected 94 quantitative trait loci (QTLs) for seed pigments (44 for embryos and 50 for seed coat), distributed over 15 of the 19 rapeseed chromosomes. These included 28 QTLs for anthocyanidin content, explaining 2.41–44.66% of phenotypic variation; 24 QTLs for flavonoid content, explaining 2.41–20.26% of phenotypic variation; 16 QTLs for total phenol content, accounting for 2.74–23.68% of phenotypic variation; and 26 QTLs for melanin content, accounting for 2.37–24.82% of phenotypic variation, indicating that these traits are under multigenic control. Consensus regions on chromosomes A06, A09 and C08 were associated with multiple seed pigment traits, including 15, 19 and 10 QTLs, respectively, most of which were major QTLs explaining >10% of the phenotypic variation. Based on the annotation of the B. napus “Darmor-bzh” reference genome, 67 candidate genes were predicted from these consensus QTLs regions, and 12 candidate genes were identified as potentially involved in pigment accumulation by RNA-seq and qRT-PCR analysis. These preliminary results provide insight into the genetic architecture of pigment biosynthesis and lay a foundation for exploring the molecular mechanisms underlying seed coat color in B. napus.
Received: 24 March 2020
|Fund: The research was supported by the National Natural Science Foundation of China (31830067), the Major S&T Projects on the Cultivation of New Varieties of Genetically Modified Organisms, China (2018ZX08020001), the Fundamental Research Funds for the Central Universities, China (XDJK2020B030), the China Agriculture Research System of MOF and MARA (CARS-12), the Natural Science Foundation of Chongqing, China (cstc2017jcyjAX0321), and the Higher Education Discipline Innovation Project, China (B12006).
Correspondence LI Jia-na, Tel/Fax: +86-23-68250642, E-mail: email@example.com; QU Cun-min, Tel: +86-23-68250701, E-mail: firstname.lastname@example.org
|About author: * These authors contributed equally to this study.
Cite this article:
ZHU Mei-chen, HU Ran, ZHAO Hui-yan, TANG Yun-shan, SHI Xiang-tian, JIANG Hai-yan, ZHANG Zhi-yuan, FU Fu-you, XU Xin-fu, TANG Zhang-lin, LIU Lie-zhao, LU Kun, LI Jia-na, QU Cun-min.
Identification of quantitative trait loci and candidate genes controlling seed pigments of rapeseed. Journal of Integrative Agriculture, 20(11): 2862-2879.
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