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

Han, Lijie, Chen, Jun, Mace, Emma S., Liu, Yishan, Zhu, Mengjiao, Yuyama, Nana, Jordan, David R. and Cai, Hongwei (2015) Fine mapping of qGW1, a major QTL for grain weight in sorghum. Theoretical and Applied Genetics, 128 9: 1813-1825. doi:10.1007/s00122-015-2549-2


Author Han, Lijie
Chen, Jun
Mace, Emma S.
Liu, Yishan
Zhu, Mengjiao
Yuyama, Nana
Jordan, David R.
Cai, Hongwei
Title Fine mapping of qGW1, a major QTL for grain weight in sorghum
Formatted title
Fine mapping of qGW1, a major QTL for grain weight in sorghum
Journal name Theoretical and Applied Genetics   Check publisher's open access policy
ISSN 0040-5752
Publication date 2015-06-13
Year available 2015
Sub-type Article (original research)
DOI 10.1007/s00122-015-2549-2
Volume 128
Issue 9
Start page 1813
End page 1825
Total pages 13
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2016
Language eng
Formatted abstract
Key message: We detected seven QTLs for 100-grain weight in sorghum using an F2 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.
Keyword Cereal crops
Grain weight
Sorghum - Growth
Ssr markers
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2016 Collection
 
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