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• W3108758045 abstract "Abstract Background Appropriate information about genetic diversity and population structure of germplasm improves the efficiency of plant breeding. The low productivity of Nepali bread wheat ( Triticum aestivum L.) is a major concern particularly since Nepal is ranked the 4th most vulnerable nation globally to climate change. The genetic diversity and population structure of Nepali spring wheat have not been reported. This study aims to improve the exploitation of more diverse and under-utilized genetic resources to contribute to current and future breeding efforts for global food security. Results We used genotyping-by-sequencing (GBS) to characterize a panel of 318 spring wheat accessions from Nepal including 166 landraces, 115 CIMMYT advanced lines, and 34 Nepali released varieties. We identified 95 K high-quality SNPs. The greatest genetic diversity was observed among the landraces, followed by CIMMYT lines, and released varieties. Though we expected only 3 groupings corresponding to these 3 seed origins, the population structure revealed two large, distinct subpopulations along with two smaller and scattered subpopulations in between, with significant admixture. This result was confirmed by principal component analysis (PCA) and UPGMA distance-based clustering. The pattern of LD decay differed between subpopulations, ranging from 60 to 150 Kb. We discuss the possibility that germplasm explorations during the 1970s–1990s may have mistakenly collected exotic germplasm instead of local landraces and/or collected materials that had already cross-hybridized since exotic germplasm was introduced starting in the 1950s. Conclusion We suggest that only a subset of wheat “landraces” in Nepal are authentic which this study has identified. Targeting these authentic landraces may accelerate local breeding programs to improve the food security of this climate-vulnerable nation. Overall, this study provides a novel understanding of the genetic diversity of wheat in Nepal and this may contribute to global wheat breeding initiatives." @default.
• W3108758045 created "2020-12-07" @default.
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• W3108758045 date "2020-11-23" @default.
• W3108758045 modified "2023-10-09" @default.
• W3108758045 title "Population structure of Nepali spring wheat (Triticum aestivum L.) germplasm" @default.
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• W3108758045 doi "https://doi.org/10.1186/s12870-020-02722-8" @default.
• W3108758045 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7682013" @default.
• W3108758045 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33225886" @default.
• W3108758045 hasPublicationYear "2020" @default.
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