Abstract:
Aim. Further improvement and application of modern methods of wheat breeding of different types of development for
adaptiveness caused by change in the character of manifestation of limiting environmental factors under conditions of
the Southern Ukrainian Steppe. Methods. Field experiment, selection and genetic, calculation and comparison research
methods were used. Wheat varieties of different genetic and ecological origin under different growing conditions were
examined. Results. Analysis of the parameters of plasticity and stability of the elements of the yield structure in winter
wheat varieties under different growing conditions revealed that their variability depends on both genotype and
ecological gradients. For instance, by the weight of grain from ears only the varieties Kirena and Yaroslavna were
distinguished by a high reaction to changes in growing conditions (bі= 1,215 – 1,635) among the analyzed genotypes,
the other varieties Askaniiska, Askaniiska Berehynia, Znakhidka odeska and Klarisa manifested quite high plasticity
(bі= 0,454 – 0,816). There was an analogous situation in the formation of the number of grains per ear. It is necessary to
highlight an important biological feature of these varieties which formed the highest actual productivity under late
sowing conditions and different sowing rates when compared to other varieties and realized its potentialities better.
Conclusions.The research determined that every wheat variety of different development types should be considered in
the aspect of its reaction to different growing conditions and to the capability of realizing genetic potential in a
particular ecological region. The results of estimation of adaptiveness potential determined a high degree of
homeostatici
