Abstract
Improving yield is one of the most important targets of sesame breeding. Identifying quantitative trait loci (QTLs) of yield-related traits is a prerequisite for marker-assisted selection (MAS) and QTL/gene cloning. In this study, a BC1 population was developed and genotyped with the specific-locus amplified fragment (SLAF) sequencing technology, and a high-density genetic map was constructed. The map consisted of 13 linkage groups, contained 3528 SLAF markers, and covered a total of 1312.52 cM genetic distance, with an average distance of 0.37 cM between adjacent markers. Based on the map, 46 significant QTLs were identified for seven yield-related traits across three environments. These QTLs distributed on 11 linkage groups, each explaining 2.34–71.41% of the phenotypic variation. Of the QTLs, 23 were stable QTLs that were detected in more than one environment, and 20 were major QTLs that explained more than 10% of the corresponding phenotypic variation in at least one environment. Favorable alleles of 38 QTLs originated from the locally adapted variety, Yuzhi 4; the exotic germplasm line, BS, contributed favorable alleles to only 8 QTLs. The results should provide useful information for future molecular breeding and functional gene cloning.
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Funding
This study was supported by the China Agriculture Research System (CARS-14–1-01), the National Natural Science Foundation of China (31301359), the Key Project of Science and Technology of Henan Province (201300110600), the Key R & D and Promotion Projects of Henan Province (202102110026), and the Science-Technology Foundation for Outstanding Young Scientists of Henan Academy of Agricultural Sciences (2018YQ27, 2020YQ26).
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Y.Z. and Q.M. designed the study. H.M. and Y.L. developed populations and performed data analyses. H.M. wrote and Y.L. revised the manuscript. C.C., C.H., F.X., L.Z, Z.D., K.W., and X.J. took part in some of the field and/or library work. All authors read and approved the final manuscript.
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Mei, H., Liu, Y., Cui, C. et al. QTL mapping of yield-related traits in sesame. Mol Breeding 41, 43 (2021). https://doi.org/10.1007/s11032-021-01236-x
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DOI: https://doi.org/10.1007/s11032-021-01236-x