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Fine mapping of qGW1, a major QTL for grain weight in sorghum

Han, Lijie and Chen, Jun and Mace, EmmaS and Liu, Yishan and Zhu, Mengjiao and Yuyama, Nana and Jordan, DavidR and Cai, Hongwei (2015) Fine mapping of qGW1, a major QTL for grain weight in sorghum. Theoretical and Applied Genetics . pp. 1-13. ISSN 0040-5752

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Article Link(s): http://dx.doi.org/10.1007/s00122-015-2549-2

Abstract

Key message

We detected seven QTLs for 100-grain weight in sorghum using an F 2 population, and delimited qGW1 to a 101-kb region on the short arm of chromosome 1, which contained 13 putative genes.

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
Business groups:Crop and Food Science
Subjects:Science > Biology > Genetics > Quantitative genetics (esp. Quantitative Trait Loci (QTL) articles)
Science > Botany > Genetics
Plant culture > Field crops > Sorghum
Deposited On:06 Jul 2015 02:20
Last Modified:06 Jul 2015 02:20

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