Abstract
Thousand seed weight (TSW) is an important trait in oilseed rape. Seed shape and seed size, which directly affect seed weight, can be characterized by seed length, seed width, length–width ratio, seed cross-section area, seed circumference, seed diameter and seed roundness. In the present study, a high-density SNP map containing 2812 bins (involving 11,458 SNPs) was used for the QTL analysis of the eight traits. As a result, 177 identified QTLs were detected in five environments, 25 for TSW and 152 for seven seed-shape traits. These QTLs were integrated into 149 consensus QTLs by a meta-analysis, including one (TSW, length–width ratio, seed length and seed width), two (seed circumference and seed diameter) and three (seed roundness) QTLs accounted for more than 10.0% of the phenotypic variation (PV). The further integration of these consensus QTLs resulted in 63 unique QTLs, of which 34 controlled at least two different traits. Notably, the unique QTL uqC2-1 affected all eight traits and explained 6.60–7.57% of the PV. Furthermore, 19 pairs of epistatic loci were detected and explained 2.39–19.17% of the PV. These results provide useful information to increase the understanding of the genetic basis of TSW and seed-shape traits.
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