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Interactions of Genotype and Glutenin Subunit Composition on Breadmaking Quality of Durum 1AS•1AL-1DL Translocation Lines

¹USDA-ARS Cereal Crops Research Unit, Northern Crop Science Laboratory, Fargo, ND 58102. Mention of trade names or commercial products in this article is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer. ²Corresponding author. Phone: (701) 239-1342. Fax: (701) 239-1369. E-mail: Daryl.Klindworth@ars.usda.gov ³Department of Plant Sciences, North Dakota State University, Fargo, ND 58108.

Dual-purpose durum (Triticum turgidum L. subsp. durum) wheat, having both good pasta and breadmaking quality, would be an advantage in the market. In this study, we evaluated the effects of genotype and varying HMW and LMW glutenin subunit composition on durum breadmaking quality. Genotypes included five near-isogenic backgrounds that also differed by variability at the Glu-D1d (HMW subunits 1Dx5+1Dy10), Glu-B1 (presence or absence of subunit 1By8), and Glu-B3 (LMWI or LMWII pattern) loci. Quality tests were conducted on genotypes grown at five North Dakota locations. Genotype had a stronger influence on free asparagine content than glutenin subunit composition. Genotypes carrying Glu-D1d had higher glutenin content than lines that did not carry Glu-D1d. Among Rugby translocation genotypes, lines carrying LMWI had higher gliadin content and better loaf volume than genotypes carrying LMWII. Absence of 1By8 produced major reductions in loaf volume in nontranslocation lines regardless of whether LMWI or LMWII was present. In contrast, the presence of Glu-D1d compensated well for the absence of 1By8 regardless of which LMW pattern was present. The durum genotypes did not have loaf volumes equal to bread wheat cultivars, and results suggest that improved extensibility is needed to improve durum breadmaking quality.