Peculiarities of the response of the productivity potential of winter rye (Secale cereale L.) hybrids on agroclimatic conditions of the central Forest-Steppe of Ukraine

Topicality. Adaptive properties and the plant resistance to adverse environmental factors greatly influence obtaining a high and stable yield, especially in adverse and extreme weather conditions. Issues. The introduction of modern Ukrainian varieties of winter rye with high adaptive properties makes it possible to solve the problem of stabilization of grain yield and production. Aim. To determine the adaptive potential of the best cytoplasmic male sterile hybrids in the environmental variety testing system. Material and methods. The initial material for research was varieties, hybrids and lines of winter rye with recessive control of stem length, donors of self-fertility and cytoplasmic male sterility from the collection of the Verkhniachka Research and Breeding Station at the Institute of Bioenergy Crops and Sugar Beets NAAS Ukraine. We have performed the research according to generally accepted methods. The response degree of genotypes to the variability of environmental conditions and the breeding value of hybrids were characterized by the coefficient of ecological plasticity b1. Results.The influence of climatic conditions on the winter rye yield was studied and the assessment of ecological plasticity and stability of hybrids was given. Based on the results of research, it is possible to recommend for cultivation of winter rye hybrids which give a stable yield regardless of weather conditions and with regression coefficient of not less than 1.0 and a minimum mean deviation from the regression line. Conclusions. During 2015–2019, approbation of hybrids was carried out in 8 regional State centers for plant variety examination of Ukraine. According to the results of the State Scientific and Technical Examination, Wals hybrid was included in the State Register of Plant Varieties Suitable for Spreading in Ukraine since 2020 and was recommended for cultivation in the Forest-Steppe zone of Ukraine. Key words: winter rye, hybrid, growing environment, ecological plasticity, yield.