Dissection of the genetic basis of oil content in Chinese peanut cultivars through association mapping

Liu, N and Huang, L and Chen, W and Wu, B and Pandey, M K and Luo, H and Zhou, X and Guo, J and Chen, H and Huai, D and Chen, Y and Lei, Y and Liao, B and Ren, X and Varshney, R K and Jiang, H (2020) Dissection of the genetic basis of oil content in Chinese peanut cultivars through association mapping. BMC Genetics (TSI), 21 (1). pp. 1-12. ISSN 1471-2156

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Background: Peanut is one of the primary sources for vegetable oil worldwide, and enhancing oil content is the main objective in several peanut breeding programs of the world. Tightly linked markers are required for faster development of high oil content peanut varieties through genomics-assisted breeding (GAB), and association mapping is one of the promising approaches for discovery of such associated markers. Results: An association mapping panel consisting of 292 peanut varieties extensively distributed in China was phenotyped for oil content and genotyped with 583 polymorphic SSR markers. These markers amplified 3663 alleles with an average of 6.28 alleles per locus. The structure, phylogenetic relationship, and principal component analysis (PCA) indicated two subgroups majorly differentiating based on geographic regions. Genome-wide association analysis identified 12 associated markers including one (AGGS1014_2) highly stable association controlling up to 9.94% phenotypic variance explained (PVE) across multiple environments. Interestingly, the frequency of the favorable alleles for 12 associated markers showed a geographic difference. Two associated markers (AGGS1014_2 and AHGS0798) with 6.90–9.94% PVE were verified to enhance oil content in an independent RIL population and also indicated selection during the breeding program. Conclusion: This study provided insights into the genetic basis of oil content in peanut and verified highly associated two SSR markers to facilitate marker-assisted selection for developing high-oil content breeding peanut varieties.

Item Type: Article
Divisions: Research Program : Genetic Gains
Uncontrolled Keywords: Peanut, Oil content, Association analysis, Geographic region
Subjects: Mandate crops > Groundnut
Others > Oilseeds
Others > Genetics and Genomics
Depositing User: Mr Arun S
Date Deposited: 21 Aug 2020 07:06
Last Modified: 21 Aug 2020 07:07
URI: http://oar.icrisat.org/id/eprint/11560
Official URL: https://doi.org/10.1186/s12863-020-00863-1
Funders: National Natural Science Foundation of China, National Peanut Industry Technology System Construction, National Plant Germplasm Resources Sharing Platform, National Program for Crop Germplasm Protection of China, The Science and technology innovation Project of Chinese Academy of Agricultural Sciences.
Acknowledgement: UNSPECIFIED
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