Blyzniuk B. Ecological features of Triticum aestivum L. agronomic trait development in different ecosystems of Ukraine

The dissertation provides theoretical generalization and practical solution of current scientific problem on determining the influence of environmental factors on yield components of winter bread wheat under environmental conditions of the Forest-Steppe and Polissia of Ukraine. Methodological approaches to the assessment of wheat geocenoconsortia for the elements of productivity, as well as and resistance to abiotic and biotic factors were optimized. It has been studied wheat diversification when taking into account the modern agro-climatic zoning of varieties based on the interaction “environment × genotype”; monitoring systems for frost resistance, heat and drought tolerance and resistance to major pathogens of wheat. For the first time, the influence of climate change on the undergoing interphase vegetation periods of wheat geocenoconsortium plants has been established. There were detected variations in the duration of the period “from resuming spring vegetation to heading”. Regularities of formation of yield components in winter wheat populations depending on ecological conditions of testing were revealed. The peculiarities of the manifestation of resistance of modern varieties to adverse environmental factors in combination with valuable economic characteristics have been established under environmental conditions and when using artificial infectious backgrounds of the pathogens Erysiphe graminis DC. f. sp. tritici, Septoria tritici Rob. et Desm, Puccinia recondita Rob. ex Desm. f. sp. tritici, which allowed identifying wheat varieties with group resistance against these pathogens. Based on phytopathological analysis, the level of infection of seeds of varieties with fungal pathogens under the conditions of testing in the Forest-Steppe and Polissia was detected. The ecological plasticity of yields of varieties in the conditions of the Forest-Steppe and Polissya is determined.