The strategy of investigation combined the effects of mutation depression evident at first generation on cell and plant level and peculiarities of recurrent mutagen action. The main purposes of investigations in this area were determination genotype-mutagen interaction for modern Ukrainian winter wheat varieties, identify less sensitive for DAB (1,4-bisdiazoatsetilbutan) genotypes and evolution recurrent mutagenesis as a method in difference alteration on first step of mutation breeding program, which limited next stages by quantity of material for selection. Here we report cytogenetic, plant growth and development characteristics of mutation induction variability of the new wheat varieties and some relationships between means of plants grows and developments, morphometrical parameters, cytogenetic characteristics and different concentrations and types of mutagens at first generation after DAB treatment.

This article examines the relationship between soil heterogeneity and cellulolytic activity. The investigated substrate was a typical chernozem (black soil). Cellulolytic activity was studied by the application method across a regular grid of 7×15 points (21×45 m). The distance between the measurement points was 3 m. Soil heterogeneity determined by the measurement of soil penetration resistance using a hand penetrometer Eijkelkamp. Measurements of soil penetration resistance were fixed to a depth of 100 cm at intervals of 5 cm. Geostatistical analysis showed a high level of spatial dependence of soil cellulolytic activity. Significant correlations were obtained between the spatial distribution of cellulolytic activity and soil penetration resistance at different depths. The results reflect a significant correlation of soil conditions at different depths.