Han, L. and Chen, J. and Mace, E.S. and et al, . (2015) Fine mapping of qGW1, a major QTL for grain weight in sorghum. Theoretical and Applied Genetics, 128 (9). pp. 1813-1825.
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Abstract
Sorghum is one of the most important cereal crops. Breeding high-yielding sorghum varieties will have a profound impact on global food security. Grain weight is an important component of grain yield. It is a quantitative trait controlled by multiple quantitative trait loci (QTLs); however, the genetic basis of grain weight in sorghum is not well understood. In the present study, using an F2 population derived from a cross between the grain sorghum variety SA2313 (Sorghum bicolor) and the Sudan-grass variety Hiro-1 (S. bicolor), we detected seven QTLs for 100-grain weight. One of them, qGW1, was detected consistently over 2 years and contributed between 20 and 40 % of the phenotypic variation across multiple genetic backgrounds. Using extreme recombinants from a fine-mapping F3 population, we delimited qGW1 to a 101-kb region on the short arm of chromosome 1, containing 13 predicted gene models, one of which was found to be under purifying selection during domestication. However, none of the grain size candidate genes shared sequence similarity with previously cloned grain weight-related genes from rice. This study will facilitate isolation of the gene underlying qGW1 and advance our understanding of the regulatory mechanisms of grain weight. SSR markers linked to the qGW1 locus can be used for improving sorghum grain yield through marker-assisted selection.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Plant Genetics and Breeding, College of Agronomy and Biotechnology, China Agricultural University, 2 Yuanmingyuan West Road, Beijing 100193, China |
| Subjects: | Crop Improvement |
| Divisions: | Sorghum |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 30 Sep 2015 10:02 |
| Last Modified: | 30 Sep 2015 10:02 |
| Official URL: | http://dx.doi.org/10.1007/s00122-015-2549-2 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/13919 |
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