Aspects Related to the Biochemistry of Resistance to Cold-Induced Stress in 4 Apricot Cultivars in the Climatic Conditions of 2018 in NW Romania

The accumulation of chill portions started in October and in early January this stage was completed (58CP), the need for cold of the cultivations studied being satisfied. The maximum amount of peroxidase in all cultivars was recorded in February when the temperatures were the lowest (0.41 U / mg at the Siren and 0.15 U / mg at CR2 / 63). Phenolic compounds are more present in the ecodormal phase of late cultivars. High values of soluble proteins were recorded in the coldest months for the determined values varying according to the ripening age of the variety (1.23 mgABS / mg at Comandor and 0.45 mgABS / mg in Rareş).