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Genetic mapping analysis of bread-making quality traits in spring wheat.

Simons, Kristin, Anderson, James A., Mergoum, Mohamed, Faris, Justin D., Klindworth, Daryl L., Xu, Steven S., Sneller, Clay, Ohm, Jae-Bom, Hareland, Gary A., Edwards, Michael C., Chao, Shiaoman
Crop Science 2012 v.52 pp. 2182
Triticum aestivum, absorption, alleles, breadmaking quality, chromosome mapping, dough, genotype-environment interaction, glutenins, heritability, inheritance (genetics), milling, milling quality, mixing, parents, plant breeding, population size, quantitative trait loci, spring wheat, wheat flour
In this study we assess the genetic architecture of bread-making quality traits in spring wheat. A mapping population derived from BR34 and Grandin, a soft x hard cross, was used to measure 20 end-use quality traits including six kernel characteristics, seven milling and flour traits, four dough mixing strength parameters, and three bread-making traits. Composite interval mapping analysis identified a total of 31 QTL significantly associated with all but two traits investigated. These QTL were found clustered in five chromosomal regions, namely 1BS, 1DL, 4BL, 5BL and 6AS, and explained a large proportion of trait variation with favorable alleles contributed by both parents. The 1DL cluster containing the high-molecular weight glutenin gene, Glu-D1, had a large genetic influence on dough mixing strength and bread-making performance. Most of the QTL affecting kernel characteristics were clustered on 6AS. Inconsistency of QTL locations detected from different environments was observed for the flour and milling traits and was likely due to G x E effects. Despite high heritabilities estimated for the 20 quality traits evaluated, no QTL were detected for flour brightness and bake mixing water absorption, suggesting that these traits may be controlled by QTL with small effects that could not be detected due to the small population size. Because of the complex inheritance of these traits, it will be necessary to validate these QTL in different spring wheat backgrounds that are evaluated in similar growth conditions as used in this study, before the marker information can be used for breeding applications.