Grain protein quality (gluten strength) and quantity affect the quality of pasta extruded from durum wheat (Triticum turgidum L. var. durum) semolina. Previously, an accession of wild emmer (Triticum turgidum L. var. dicoccoides) with high protein concentration was used to develop a complete set of ‘Langdon’ (T. dicoccoides) [LDN(DIC)] substitution lines. This study was conducted to evaluate the potential of using these LDN(DIC) substitution lines as parents for deriving lines with increased grain protein concentration and acceptable gluten strength. Each of the 14 substitution lines and Langdon parent were crossed to a common male parent, ‘Vic’. Parents and F2:4 and F2:5 lines were grown in replicated trials at two locations in North Dakota in 1989 and 1991. Grain protein concentration and sodium dodecyl sulfate (SDS) sedimentation volume were measured. Population means and genetic variances were compared with those of the Langdon/Vic population to identify substitution lines that conferred improved quality characteristics, and to determine their potential use in a breeding program. Heritabilities were estimated from standard‐unit parentoffspring regression and from variance components. LDN(DIC) chromosome substitution populations 1A, 6A, 5B, and 6B were significantly higher than the Longdon/Vic population in grain protein concentration. One population, LDN(DIC) 1B, was significantly higher in sedimentation volume than the Langdon/Vic population. The results indicated that selected LDN(DIC) substitution lines, especially LDN(DIC) 5B and 6B, when crossed to a strong gluten parent, may be useful in deriving lines with increased protein quantity and quality.

Improving yield and other agronomic traits in durum wheat(Triticum turgidum L. var. durum) depends on adequate genetic diversity. Genetic diversity in durum wheat is limited. An accession of wild emmer (Triticum turgidum L. var. dicoccoides) with high protein concentration was used to develop a complete set of ‘Langdon’ (T. dicoccoides) [LDN(DIC)] substitution lines. This study was conducted evaluate the potential of using these substitution lines as parents for deriving lines with acceptable agronomic traits. Each of the 14 substitution lines and Langdon were crossed to a common male parent, ‘Vic’. Parents, F2:4, and F2:5 lines were grown in replicated trials at two locations in North Dakota in 1989 and 1991, respectively. Days to heading, plant height, grain yield, and kernel weight were measured. Population means and genetic variances were compared to those of the Langdon/Vic population to identify substitution lines that conferred favorable agronomic characteristics to derived lines. Heritabilities were estimated based on parent‐offspring regression and variance components. All substitution populations except these with LDN(DIC) 4B and 5B were earlier in heading date than the Langdon/Vic population. Langdon dicoccoides substitution populations 1A, 2A, 4A, 6A, 7A, 1B, 4B, 5B, and 6B were significantly shorter than the Langdon/Vic population. Langdon dicoccoides substitution population 4B had higher yield than the Langdon/Vic population. Langdon dicoccoides substitution populations 2A, 3A, and 5B had a mean kernel weight greater than the Langdon/Vic population. Our data suggests that there is a possibility of deriving lines with high grain yield and good agronomic traits from LDN(DIC) 4B.

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