GRAIN-YIELD AND QUALITY CHARACTERISTICS OF CHROMOSOME 1D AND 1B SUBSTITUTION LINES IN DURUM-WHEAT AND THEIR F-2-DERIVED PROGENY LINES .2. PRELIMINARY COMPARISONS WITH NORMAL DURUM AND BREAD WHEATS

The grain yield and quality characteristics of three types of wheat, b read wheat, durum wheat and chromosome 1D substituted durum wheats, we re studied. The yields of the durum wheats were less than half those o f the bread wheats, but higher than the durum substitution lines carry ing chromosome 1D. Grain protein content was correlated negatively wit h grain yield among the hexaploid wheats, but not among the tetraploid s. The proportion of glutenin in flour measured by SE-HPLC was correla ted consistently with all Mixograph quality parameters. Durum wheat li nes carrying the gamma-45 prolamin (gliadin) band gave values for the proportion of total and highly-aggregated glutenin that were similar t o those of medium strength bread wheats, whereas the Langdon 1D(1A) te traploid lines were similar to medium dough strength hexaploid wheats as measured by SDS-sedimentation values.