Potato protein is recognized as one of the most valuable plant proteins due to its high content of essential amino acids. Changes in the metabolic composition of potato tubers during low temperature storage can affect their nutritional value. In the course of study, the amino acid composition of potato tubers was determined, differing in the color of the pulp stored at a temperature of 2 °C for 7 months. The research included the study of 3 hybrids of potato and potato variety of standard Nevsky, hybrid 10.76.1 with red peel, others with yellow peel. With increasing storage time, the total protein content and especially the amino acid content increased. The determination of amino acids was carried out according to “M-04-38-2009” with the system of capillary electrophoresis “Drops-105”, the starch content – by specific gravity (GOST 7194-81); reducing sugars – according to the Sumner method; crude protein – according to the Kjeldahl method, GOST 13496.4-93; nitrate content – by ion-metric, according to GOST 29270-95. Biochemical analysis of potato tubers allows us to highly evaluate of the hybrid 10.76.1 with red peel according to the EAA amino acid composition index with an indicator of 61.6 to 63.1 % and taste with an indicator 7.9 to 6.5 points and the ratio of starch/protein with an indicator of 14.0 to 15.7, which is higher than similar indicators of the Nevsky standard.

Abstract. The purpose of the research is to assess the Belarusian potato varieties in terms of adaptability, ecological plasticity and stability. To establish the possibility of their cultivation in the conditions of the Chelyabinsk region. Research methods. The assessment of the adaptive potential of potatoes was carried out according to the classical method presented by V. A. Zykin. Results. Allocated 21 adaptive varieties suitable for cultivation in the South Urals. Analysis of ecological plasticity and stability showed that these qualities are combined in Belarusian varieties: Briz (35.7 t/ha; bi = 0.86; Si2 = 7.4), Manifest (35.4 t/ha; 0.92; 7.8), Pershatsvet (34.4 t/ha; 1.20; 29.2), Palats (33.2 t/ha; 1.08; 25.8), in domestic varieties: Spiridon (32.1 t/ha; 1.04; 0.3) and Irbitskiy (33.1 t/ha; 0.81; 23.5), as well as in the Gala variety (38.4 t/ha; 0.98; 2.2) created in Germany. Genotypes of the intensive type include the Chelyabinsk varieties: Tarasov (40.3 t/ha; bi = 1.89) and Zakhar (38.0 t/ha; 1.28), the Belarusian variety Uladar (36.8 t/ha; 1.64) and foreign varieties: Koroleva Anna (45.9 t/ha; 1.61), Zekura (35.7/ha; 1.57) and Rozara (32.0 t/ha; 1.56). A group of varieties of a neutral type was identified, which weakly responds to changes in growing conditions: Kavaler (bi = 0.33), Kashtak (0.63), Amulet (0.65) and Kuzovok (0.77) of the Chelyabinsk selection and the variety Lad (0.73) and Yanka (0.73) of the Belarusian selection. The wide distribution of foreign varieties Koroleva Anna, Rozara and Zekura in agricultural enterprises of the Chelyabinsk region is explained by their high responsiveness to intensification of production, while the Gala variety combines ecological plasticity and stability. Scientific novelty. The assessment of the adaptive potential of potato varieties created in the Republic of Belarus made it possible to identify seven adaptive varieties suitable for cultivation in the South Urals. The Uladar variety belongs to the intensive type genotypes. Varieties Briz, Manifest, Pershatsvet and Palats combine high productivity, environmental plasticity and stability. Potato varieties Yanka and Lad react poorly to changing growing conditions.

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