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ARS Home » Midwest Area » Madison, Wisconsin » Cereal Crops Research » Research » Publications at this Location » Publication #102879
Title: QTL ANALYSIS OF MALTING QUALITY IN BARLEY BASED ON THE DOUBLED HAPLOID PROGENY OF TWO ELITE NORTH AMERICAN VARIETIES REPRESENTING DIFFERENT GERMPLASM GROUPS

Author
item MARQUEZ-CEDILLO, L - OREGON STATE UNIVERSITY
item HAYES, P - OREGON STATE UNIVERSITY
item Jones, Berne
item KLEINHOFS, A - WASHINGTON STATE UNIV.
item LEGGE, W - AGRIC. & AGRI-FOOD/CANADA
item ROSSNAGEL, B - UNIV OF SASKATCHEWAN
item SATO, K - OKAYAMA UNIVERSITY
item ULLRICH, S - WASHINGTON STATE UNIV
item Wesenberg, Darrell

Submitted to: Barley Newsletter
Publication Type: Abstract Only
Publication Acceptance Date: 7/10/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Characterization of the determinants of economically important phenotypes showing complex inheritance should lead to more effective use of genetic resources. This study was conducted to determine the number, genome location and effects of QTLs determining malting quality in the two North American barley quality standards. Using a doubled haploid population of 140 lines from the cross of Harrington x Morex, malting quality phenotype data sets from eight environments, and a 107-marker linkage map, QTL analyses were performed using simple interval mapping and simplified composite interval mapping procedures. Seventeen QTLs were associated with seven grain and malting quality traits (% of plump kernels, test weight, grain protein percentage, soluble/total (S/T) protein ratio, alpha-amylase activity, diastatic power and malt extract percentage). QTLs for multiple traits were coincident. The loci controlling inflorescence type (V on chromosome 2 and i on chromosome 4) were coincident with QTLs affecting all traits except malt extract percentage. The largest effect QTLs, for percentage of plump kernels, test weight, grain protein percentage, S/T ratio, and diastatic power, were coincident with the V locus. QTL analyses were conducted separately for each sub-population (six-rowed and two-rowed even new QTLs were detected in the subpopulations. There were significant interactions between the V and i loci for grain protein percentage and S/T protein ratio. Results suggest that this mating of two different germplasm groups caused a disruption of the balance of traits. Information on the number, position and effects of QTLs determining components of malting quality may be useful for maintaining specific allele configurations that determine target quality profiles.