Mapping quantitative trait loci for yield-related traits in Chinese cabbage (Brassica rapa L. ssp. pekinensis)
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Chinese cabbage (Brassica rapa L. ssp. pekinensis) is one of the most important vegetables in China. However, the inheritance of yield-related traits in Chinese cabbage is poorly understood to date. To map quantitative trait loci (QTL) for yield-related traits in Chinese cabbage, a genetic linkage map was constructed with 192 doubled haploid (DH) lines. The genetic map was constructed based on 190 sequence-related amplified polymorphisms and 43 simple sequence repeats. QTL mapping was conducted for 11 yield-related traits in 170 DH lines derived from a cross between two diverse Chinese cabbage lines, ‘WZ’ and ‘FT’, under different environmental conditions. A total of 46 main QTL (M-QTL) and 7 epistatic QTL (E-QTL) were identified. The phenotypic variation explained by each M-QTL and E-QTL ranged from 4.85 to 25.06 % and 1.85 to 13.29 %, respectively. The QTL-by-environment interactions were detected using the QTLNetwork 2.0 program in joint analyses of multi-environment phenotypic values. The phenotypic variation explained by each QTL and by QTL × environment interaction was 1.14–4.24 % and 0.00–1.26 %, respectively. Our results provide a better understanding of the genetic factors controlling leaf and head-related traits in Chinese cabbage.
KeywordsSimple sequence repeat (SSR) Quantitative trait loci (QTL) mapping Inheritance Yield-related traits QTLNetwork 2.0 Chinese cabbage
This research was financially supported by a Grant from the National Natural Science Foundation of China (No. 31071792, 31272157).
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