I. Stoeva

Abstract. This study investigated the changes in the technological properties of common winter wheat lines of the latest generation of DAI breeding during the period 2004 – 2008. The dynamics of meteorological factors during the years of investigation typical for the region of Dobrudzha allowed better evaluation of the quality of the cultivars under biotic and abiotic stress. The results from the investigation showed that cultivars Aglika, Dona, Enola, Bolyarka and Iveta were a contribution to the breeding reality of quality wheat in Bulgaria. The degree of modification of most of the technological indices of the investigated cultivars was significant and depended on the source of variation (genotype, environment and the genotype x environment interaction). The genotype effects were most important in determining glassiness, sedimentation, pharinograchic value and the characteristics of bread (>50%). The effect of the year was lower (<30%). The percent of the cultivar x year interaction was significant for wet gluten yield in 70 % flour and the pharinographic stability of dough (>70 %). The increase of the mean daily relative air humidity and the sum of rainfalls during the first decade of June had on the whole a negative effect on test weight, glassiness and partially – on wet gluten in 70 % flour of cultivars Karat, Aglika, and Iveta. The high mean daily air temperature during the first decade of June had a negative effect on bread volume, form resistance, crumb quality, dough stability and sedimentation of most of the investigated cultivars.