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• W4295838456 abstract "Capsaicinoids provide chili peppers (Capsicum spp.) with their characteristic pungency. Several structural and transcription factor genes are known to control capsaicinoid contents in pepper. However, many other genes also regulating capsaicinoid contents remain unknown, making it difficult to develop pepper cultivars with different levels of capsaicinoids. Genomic selection (GS) uses genome-wide random markers (including many in undiscovered genes) for a trait to improve selection efficiency. In this study, we predicted the capsaicinoid contents of pepper breeding lines using several GS models trained with genotypic and phenotypic data from a training population. We used a core collection of 351 Capsicum accessions and 96 breeding lines as training and testing populations, respectively. To obtain the optimal number of single nucleotide polymorphism (SNP) markers for GS, we tested various numbers of genome-wide SNP markers based on linkage disequilibrium. We obtained the highest mean prediction accuracy (0.550) for different models using 3294 SNP markers. Using this marker set, we conducted GWAS and selected 25 markers that were associated with capsaicinoid biosynthesis genes and quantitative trait loci for capsaicinoid contents. Finally, to develop more accurate prediction models, we obtained SNP markers from GWAS as fixed-effect markers for GS, where 3294 genome-wide SNPs were employed. When four to five fixed-effect markers from GWAS were used as fixed effects, the RKHS and RR-BLUP models showed accuracies of 0.696 and 0.689, respectively. Our results lay the foundation for developing pepper cultivars with various capsaicinoid levels using GS for capsaicinoid contents." @default.
• W4295838456 created "2022-09-15" @default.
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• W4295838456 date "2022-01-01" @default.
• W4295838456 modified "2023-09-30" @default.
• W4295838456 title "Genomic selection with fixed-effect markers improves the prediction accuracy for Capsaicinoid contents in <i>Capsicum annuum</i>" @default.
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• W4295838456 doi "https://doi.org/10.1093/hr/uhac204" @default.
• W4295838456 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36467271" @default.
• W4295838456 hasPublicationYear "2022" @default.
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