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Evaluation of Lines Derived from Wild Emmer Chromosome Substitutions: I. Quality Traits

Pioneer Hi-Bred Intl. Inc., Napoleon, OH4345
Dep. of Plant Sciences, North Dakota State Univ., Fargo, ND 58105-5051
Dep. of Agronomy and Horticulture, New Mexico State Univ., Las Cruces, NM 88003-0003

^* Corresponding author (nu052359{at}vml.nodak.edu).

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 F_2:4 and F_2:5 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.

Received for publication January 3, 1995.