Summary:

The aim of this study was to analyze the effect of the use of an agent inhibiting ethylene release - 1-Methylcyclopropene in the storage of selected apple varieties 'Szampion', 'Gloster', 'Elstar', 'Ligol', 'Idared', 'Jonagold', and 'Honeygold' originating from orchards of the Fruit Plant in Wtelno and stored in chambers with a controlled atmosphere. Laboratory analyzes were performed immediately after harvest and after 6 months of storage in chambers under ULO conditions (<2% O2, <2% CO2) at a tem-perature of 1.5-2.0°C and relative air humidity of 95-96%. Fruits treated with 1-MCP were characterized by significantly lower losses of bioactive compounds, especially vitamin C, compared to untreated apples. The contents of total polyphenols and chlorogenic acid remained at a similar level as after harvest in untreated apple samples. After the storage peri-od, the 'Szampion' variety contained significantly the most polyphenolic compounds, and the least - the 'Honeygold' variety, where the highest de-crease was also recorded during storage (26.7%) in fruits not treated with 1-MCP. After storage, the 'Ligol' and 'Elstar' cultivars had the significant-ly highest content of chlorogenic acid. The highest losses of chlorogenic acid during apple storage (32.4%) were observed in the 'Honeygold' vari-ety. The lowest loss of ascorbic acid during apple storage (34.9%) was observed in the 'Idared' variety, and the highest loss in the 'Honeygold' variety (66.8%).