INVESTIGATION ON THE EFFECTS OF THE GENOTYPE X ENVIRONMENT INTERACTION IN SOME NEW BULGARIAN COMMON WINTER WHEAT CULTIVARS

Fifteen new Bulgarian common winter wheat cultivars were investigated for ecological plasticity and stability in four replicates of a randomized experiment during 2014 – 2016. The applied two-factor dispersion analysis proved the different genetic potential of the group of cultivars according to the investigated indices to the highest degree of statistical significance, as well as the effect of the climatic conditions. The genotype x ecological conditions interaction was significant for all indices, which was a necessary prerequisite to apply AMMI models for evaluation of the cultivars’ ecological plasticity and stability according to the investigated indices. The use of the АММI models allowed the evaluation of the ecological plasticity on the basis of the statistical parameters ASV, and of the ecological stability on the basis of the reliability index I. According to the index yield, cultivar Laska was with the highest plasticity and stability, ranking first among all cultivars. Cultivars Laska, Progress, Enola, Bezostaya 1, Kristi and Yantur demonstrated high ecological plasticity and stability according to the complex of all investigated traits.