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Comparative analysis of Australian and Canadian barleys for seed dormancy and malting quality

Zhang, Xiao-Qi, Westcott, Sharon, Panozzo, Joe, Cakir, Mehmet, Harasymow, Stefan, Tarr, Allen, Broughton, Sue, Lance, Reg, Li, Chengdao
Euphytica 2012 v.188 no.1 pp. 103-111
alleles, barley, beta-glucans, chromosomes, crossing, genetic markers, germination, haploidy, malt, malting barley, malting quality, quantitative trait loci, seed dormancy, sprouting, viscosity
The association between high malting quality and pre-harvest sprouting (PHS) susceptibility is a key challenge when developing new malting barley varieties. A new malting barley variety Baudin has successfully combined high malting quality and PHS tolerance. A doubled haploid population was developed for mapping PHS tolerance and seed dormancy from a cross of Baudin × AC Metcalfe using 233 molecular markers. Three QTLs were mapped for seed dormancy based on the standard germination test at 24, 48 and 72 h. One major QTL was mapped to the long arm of chromosome 5H controlling seed dormancy and PHS tolerance from Baudin. Two other minor QTLs were identified from Baudin on chromosomes 3 and 7H. QTL/QTL interaction was detected for seed dormancy between chromosomes 3 and 5H. The PHS tolerance allele of the 5H QTL from Baudin contributes to higher malt yield without significant impact on diastatic power, beta-glucan content and wort viscosity. QTL from Baudin provide new sources to integrate PHS tolerance and high malting quality.