Author:
Chakrabarty Subhadra,Mufumbo Raphael,Windpassinger Steffen,Jordan David,Mace Emma,Snowdon Rod J.,Hathorn Adrian
Abstract
Abstract
Background
The Plant Genetic Resources Centre at the Uganda National Gene Bank houses has over 3000 genetically diverse landraces and wild relatives of Sorghum bicolor accessions. This genetic diversity resource is untapped, under-utilized, and has not been systematically incorporated into sorghum breeding programs. In this study, we characterized the germplasm collection using whole-genome SNP markers (DArTseq). Discriminant analysis of principal components (DAPC) was implemented to study the racial ancestry of the accessions in comparison to a global sorghum diversity set and characterize the sub-groups present in the Ugandan (UG) germplasm.
Results
Population structure and phylogenetic analysis revealed the presence of five subgroups among the Ugandan accessions. The samples from the highlands of the southwestern region were genetically distinct as compared to the rest of the population. This subset was predominated by the caudatum race and unique in comparison to the other sub-populations. In this study, we detected QTL for juvenile cold tolerance by genome-wide association studies (GWAS) resulting in the identification of 4 markers associated (−log10p > 3) to survival under cold stress under both field and climate chamber conditions, located on 3 chromosomes (02, 06, 09). To our best knowledge, the QTL on Sb09 with the strongest association was discovered for the first time.
Conclusion
This study demonstrates how genebank genomics can potentially facilitate effective and efficient usage of valuable, untapped germplasm collections for agronomic trait evaluation and subsequent allele mining. In face of adverse climate change, identification of genomic regions potentially involved in the adaptation of Ugandan sorghum accessions to cooler climatic conditions would be of interest for the expansion of sorghum production into temperate latitudes.
Funder
Deutsche Forschungsgemeinschaft
Justus-Liebig-Universität Gießen
Publisher
Springer Science and Business Media LLC
Reference50 articles.
1. Hariprasanna K, Patil JV. In: Madhusudhana R, Rajendrakumar P, Patil JV, editors. Sorghum: origin, classification, biology and improvement BT - Sorghum molecular breeding. New Delhi: Springer India; 2015. p. 3–20. https://doi.org/10.1007/978-81-322-2422-8_1.
2. National Research Council . Lost crops of Africa: volume I. Washington, DC: grains: National Academies Pres; 1996.
3. Paterson AH, Bowers JE, Bruggmann R, Dubchak I, Grimwood J, Gundlach H, et al. The Sorghum bicolor genome and the diversification of grasses. Nature. 2009;457(7229):551–6. https://doi.org/10.1038/nature07723.
4. Sorghum DH. Longman scientific & technical. New York: Wiley; 1988.
5. Snowden JD. The cultivated races of sorghum. The cultivated races of sorghum. 1936.
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