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The article presents the results of a two-year comparative study of the biochemical composition of fruit of six Oxycoccus macrocarpus cultivars newly introduced in Belarus — ‘Stevens’, ‘Bain Favorit’, ‘Hiliston’, ‘Holistar Red’, ‘Stankovich’, and ‘WSU 108’ — based upon 14 indicators in seasons that are contrasted in terms of the moisture regime. It is established that the favorable combination of weather conditions in 2016 contributed to the increasingly active accumulation of free organic, ascorbic and hydroxycinnamic acids, soluble sugars, true anthocyanins, catechins, and flavonols in fruit, by 8-62 %, compared with the rainless season of 2015. Furthermore, the sugar-acid index went up by 15 %, which indicates an improvement in the organoleptic properties of fruit, amid a reduction, by 9-33 %, of the content of leucoanthocyanins, dry and pectic substances, and tannins. Based upon the findings of the comparative analysis of the variability levels of the biochemical composition of cranberry fruit during the two-year observation cycle, it is established that the accumulation of dry substances, ascorbic and hydroxycinnamic acids, as well as the total amount of anthocyanin pigments and bioflavonoids was characterized by the least marked interseasonal differences; whereas the most conspicuous differences were reported for the sugar-acid index and content of soluble sugars, pectic substances, leucoanthocyanins, and flavonols. Within the taxonomic range of large cranberry, ‘Stankovich’ showed most resistance of its biochemical composition to overall weather factors; while ‘Bain Favorit’ and especially ‘Hiliston’ were characterized by least resistance.

Impact of Weather Conditions on the Variability of the Biochemical Composition of Fruit of Oxycoccus Macrocarpus Ait.Pers. Introduced In Belarus