Aim. Study of polymorphism of alpha amylase in winter wheat varieties. Methods. Isoenzymes of alpha-amylase were detected by electrophoretic protein separation in a polyacrylamide gel. The germination index (GI) was calculated by Walker-Simmons: GI = (7xn1 + 6xn2 + ... + 1xn7) / 7 x N, where n1, n2, ..., n7 is the number of seeds sprouted on the first, second, and further days to the seventh day, respectively, N – the total number of grains. Results. Varieties were explored: Institute of Plant Physiology and Genetics of the National Academy of Sciences of Ukraine, Kiev, The Plant Breeding and Genetics Institute – National Center of Seed and Cultivar Investigation of the National Academy of Agricultural Sciences of Ukraine, Odesa and german varieties.The polymorphism of wheat grain alpha-amylase was detected by the method of electrophoretic protein separation. We searched associations between variants of alpha-amylase and resistance to pre-harvest germination, the germination index in the studied samples was determined. Conclusions. The frequency of the prevalence of variants for isoenzymes of alpha-amylase in soft wheat varieties was estimated. It was shown that genotypes containing the variant of the isoenzymes АbC are more resistant to pre-harvest germination. Among the studied varieties of PBGI NAAS and IPPG NAS of Ukraine, the variant of alpha-amylase AbC. Keywords: α-amylase, soft wheat, electrophoresis, varieties.

Aim. Study of alpha amylase polymorphism in winter wheat varieties. Methods. Isoenzymes of alpha-amylase were detected by electrophoretic protein separation in a polyacrylamide gel. The fall number on the Falling Number 1700 was determined. Results. Strains from various collections were explored: Institute of Plant Physiology and Genetics of the National Academy of Sciences of Ukraine, Kiev, The Plant Breeding and Genetics Institute – National Center of Seed and Cultivar Investigation of the National Academy of Agricultural Sciences of Ukraine, Odesa and german strains. The polymorphism of wheat grain alpha-amylase was detected by the method of electrophoretic protein separation. We searched associations between variants of alpha-amylase and resistance to pre-harvest germination, the falling number in the examined samples was determined. Conclusions. The frequency of the prevalence of variants for isoenzymes of alpha-amylase in soft wheat varieties was estimated. It was shown that genotypes containing the variant of the isoenzymes АbC are more resistant to pre-harvest germination. Among the studied varieties of PBGI NAAS and IPPG NAS of Ukraine, the variant of alpha-amylase AbC. Keywords: α-amylase, isoenzymes, soft wheat, electrophoresis, falling number.