Genotype-environment interaction of barley doubled haploids with regard tomalting quality

The genotype-environment (GE) interaction of barley doubled haploid (DH) li nes was studied in relation to some malting quality characters. DH lines we re obtained, using the bulbosum method, from F-1 hybrids between the cultiv ars 'Grit' and 'Havila'. Thirty DH lines, the parental forms, F-2 and F-3 h ybrids of 'Grit' x 'Havila' and the standard cultivar 'Rudzik' were studied in a series of field experiments repeated at six environments. Malt protei n content, Kolbach index, extract yield and malt fine-coarse difference wer e measured. The statistical analysis was performed using the computer progr am SERGEN. For protein content, it was found that most of the lines studied were stable, i.e. their GE interactions were not significant. Among the ma lt traits, phenotypic values of Kolbach index and fine-coarse difference we re most dependent on environmental conditions. For Kolbach index, only one line was found to be stable, while for fine-coarse difference, all lines di splayed interaction with the environment.