Abstract
The cold-tolerance of ‘Kristall’ (Euro-Amur-American origin), ‘Dostoyniy’ and ‘Krasnostop AZOS’ (interspecific hybrids of Euro-American origin) grapevine varieties in the winter conditions of South Russia is characterised by the second (true dormancy) and third (induced dormancy) winter-resistance components. Here we used a complex approach to estimate plant adaptation to abiotic stress factors. We used the gravimetric method for humidity assessment and water content, spectral analysis for detection of the protein level and pigments and capillary electrophoresis to determine the level of carbohydrates, Krebs cycle organic acids, phenolcarbonic, ascorbic acids, and amino acids. The obtained results allow to suggest various mechanisms of adaptation of the studied varieties to the winter period stressors. The water content of shoots, levels of protein, amino acids, proline, sugars and the sum of phenolcarbonic acid and ascorbic acid are the most informative indicators of grape plants frost-resistance in the climate conditions of the Anapa–Taman region.