Abstract
A previous study in wheat (Triticum aestivum L.) identified two candidate genes controlling a quantitative trait locus (QTL) for high-molecular-weight glutenin subunit (HMW-GS) GluBx. These candidates were Glu-B1-1, the structural gene coding for Glu1Bx, and the B homoeologous gene coding for SPA (spa-B), a seed storage protein activator. The goal of this study was to identify the best candidate gene for this QTL. Single nucleotide polymorphisms (SNPs) are an abundant source of DNA polymorphisms that have been successfully used to identify loci associated with particular phenotypes. As no linkage disequilibrium was detected between Glu-B1-1 and spa-B, we performed an association study to identify the individual gene responsible for the QTL. Six SNPs, three located in Glu-B1-1 and three in spa-B, were genotyped by mass spectrometry in a collection of 113 bread wheat lines. These lines were also evaluated for protein content as well as the total quantity of HMW-GSs and of each HMW-GS in seed samples from two harvest years. Significant associations were detected only between Glu-B1-1 polymorphism and most of the traits evaluated. Spa-B was unambiguously discarded as a candidate. To our knowledge, this is the first report on an association study that was successfully used to discriminate between two candidate genes.
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Acknowledgements
The authors thank D. Goodfellow and F. Vear for improving upon their English, B. Debote, B. Duperrier and their staff for high-quality experimentation, S. Giancola and A. Bérard for genotyping. This research was funded by the French federative genomic programme Génoplante.
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Ravel, C., Praud, S., Murigneux, A. et al. Identification of Glu-B1-1 as a candidate gene for the quantity of high-molecular-weight glutenin in bread wheat (Triticum aestivum L.) by means of an association study. Theor Appl Genet 112, 738–743 (2006). https://doi.org/10.1007/s00122-005-0178-x
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DOI: https://doi.org/10.1007/s00122-005-0178-x