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

BMC Genetics

Rajeev K. Varshney¹  Manish K. Pandey¹  Huifang Jiang²  Boshou Liao²  Li Huang²  Bei Wu²  Xiaojing Zhou²  Xiaoping Ren²  Jianbin Guo²  Haiwen Chen²  Nian Liu²  Yong Lei²  Yuning Chen²  Weigang Chen²  Huaiyong Luo²  Dongxin Huai² 

[1]International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)

[2]Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences

关键词: Peanut;    Oil content;    Association analysis;    Geographic region;   

DOI  :  10.1186/s12863-020-00863-1

来源: DOAJ

【 摘 要 】

Abstract 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.

【 授权许可】

Unknown