Huang, L. and He, H. and Chen, W. and Ren, X. and etl, . (2015) Quantitative trait locus analysis of agronomic and quality‑related traits in cultivated peanut (Arachis hypogaea L.). Theoretical and Applied Genetics, 128 (6). pp. 1103-1115.
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Abstract
Key message SSR-based QTL mapping provides useful information for map-based cloning of major QTLs and can be used to improve the agronomic and quality traits in cultivated peanut by marker-assisted selection. Abstract Cultivated peanut (Arachis hypogaea L.) is an allotetraploid species (AABB, 2n = 4× = 40), valued for its edible oil and digestible protein. Linkage mapping has been successfully conducted for most crops, and it has been applied to detect the quantitative trait loci (QTLs) of biotic and abiotic traits in peanut. However, the genetic basis of agronomic and quality-related traits remains unclear. In this study, high levels of phenotypic variation, broad-sense heritability and significant correlations were observed for agronomic and quality-related traits in an F2:3 population. A genetic linkage map was constructedfor cultivated peanut containing 470 simple sequence repeat (SSR) loci, with a total length of 1877.3 cM and average distance of 4.0 cM between flanking markers. For 10 agronomic traits, 24 QTLs were identified and each QTL explained 1.69–18.70 % of the phenotypic variance. For 8 quality-related traits, 12 QTLs were identified that explained 1.72–20.20 % of the phenotypic variance. Several QTLs for multiple traits were overlapped, reflecting the phenotypic correlation between these traits. The majority of QTLs exhibited obvious dominance or over-dominance effects on agronomic and quality traits, highlighting the importance of heterosis for breeding. A comparative analysis revealed genomic duplication and arrangement of peanut genome, which aids the assembly of scaffolds in genomic sequencing of Arachis hypogaea. Our QTL analysis results enabled us to clearly understand the genetic base of agronomic and quality traits in cultivated peanut, further accelerating the progress of map-based cloning of major QTLs and marker-assisted selection in future breeding.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Quantitative trait, agronomic,peanut (Arachis hypogaea L.) |
| Author Affiliation: | Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture, Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan 430062, China |
| Subjects: | Crop Improvement |
| Divisions: | Groundnut |
| Depositing User: | Mr T L Gautham |
| Date Deposited: | 08 May 2018 06:09 |
| Last Modified: | 08 May 2018 06:09 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/15432 |
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