Abstract
Traditional breeding methods usually involve field tests carried out by experienced breeders. However, such methods are costly and time-consuming. Recently, with the development of Next-Generation Sequencing (NGS) technology, molecular markers are being utilized for selection processes in breeding. To implement a high-throughput system using molecular markers in Chinese cabbage (Brassica rapa subsp. pekinensis) breeding, we developed single nucleotide polymorphism (SNP) marker sets for background selection and testing F1 purity using Fluidigm genotyping assays. SNPs were generated using NGS technology on 209 varieties of Chinese cabbage collected from around the world. Those with minor allele frequency ≥ 5% and polymorphism information content ≥ 0.3 were screened, and then based on the physical distribution among the 10 chromosomes, 177 SNPs were selected and synthesized for testing. To obtain marker sets with high selection efficiency, we tested 192 SNPs on 45 types of inbred lines and 29 types of F1 hybrids. Among the 192 SNPs, we selected 96 markers sets for background selection and 24 marker sets for F1 purity testing according to the following criteria; the genotype of the parents was homozygous, and the F1 follows the parents’ genotypes. These SNP sets are suitable for high-throughput systems using the 96.96 and 192.24 integrated fluidic circuit platforms of Fluidigm genotyping assays. These SNP marker sets are not only efficient for selecting of early fixed lines as background selection but are also useful for testing the purity of F1 hybrids.
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Acknowledgements
This work was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, and Forestry (IPET) through Golden Seed Project (213006-05-3-SB110, 213006-05-3-SBD30), funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA), Ministry of Oceans and Fisheries (MOF), Rural Development Administration (RDA) and Korea Forest Services (KFS).
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SRC designed the experiment. SHO, HAK, IJ, and JJR performed the experiment. SRC, SHO, and VD analyzed the data. SRC and SHO wrote the manuscript. CSJ and CHA provided the plant materials. YPL supervised the experiment and provided valuable suggestion.
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Communicated by Inhwa Yeam.
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Choi, S.R., Oh, S.H., Dhandapani, V. et al. Development of SNP markers for marker-assisted breeding in Chinese cabbage using Fluidigm genotyping assays. Hortic. Environ. Biotechnol. 61, 327–338 (2020). https://doi.org/10.1007/s13580-019-00211-y
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DOI: https://doi.org/10.1007/s13580-019-00211-y