GRAIN QUALITY AND YIELD CHARACTERISTICS OF D-GENOME DISOMIC SUBSTITUTION LINES IN LANGDON (TRITICUM-TURGIDUM VAR DURUM)

Sets of D-genome disomic substitution lines of 'Langdon' (Triticum tur gidum var. durum) were used to study the effect of chromosome substitu tions on grain yield and hour technological properties. In general, th e substitution of any D-genome chromosome had a detrimental effect on grain yield and growth vigour (some lines were sterile). SDS-sedimenta tion, SE-HPLC and two-gram mixograph procedures were used to measure d ough strength of the lines studied. Significant correlations were obse rved between protein concentration and grain yield and other quality p arameters such as SDS-sedimentation value, the proportion of glutenin, dough mix time and peak resistance. Most of the quality characters we re highly correlated with each other. Substitution of chromosomes 1D, 5D, 2D and 7D resulted in positive responses to SDS-sedimentation valu es, but only chromosome 1D had positive effects on the proportion of p eak 1 (P-1%), measured by SE-HPLC. Besides the major influence of chro mosome 1D on three major mixograph parameters (mixing time, peak resis tance and resistance breakdown), chromosome SD also exhibited signific ant effects on these mixing parameters. Principal-component analysis s howed that the predominant effect on durum-wheat theological propertie s was from chromosome 1D, whereas chromosome 5D had a major effect on grain hardness (50%) and increased the whiteness of the flour.