1-Methylcyclopropene affects the antioxidant system of apricots (Prunus armeniaca L. cv. Bulida) during storage at low temperature

BACKGROUND: Apricots (Prunus armeniaca cv. Bulida) were treated with 1 mL L-1 1-methylcyclopropene (1-MCP) immediately after harvest and stored in air at 2 degrees C for 21 days. Antioxidant levels (ascorbic acid and carotenoids), enzymatic antioxidant activities (superoxide dismutase (SOD) and unspecific peroxidase (POX)) and total antioxidant capacity (trolox equivalent antioxidant capacity (TEAC)) were determined. The level of oxidative stress was also established by measuring ion leakage during storage. The changes in the antioxidant potential of apricots were related to the capacity of 1-MCP to increase their commercial life. RESULTS: 1-MCP-treated fruits exhibited higher SOD activity, whereas POX activity was significantly higher only after 21 days at 2 degrees C. Treated fruits a I so exhibited better retention of ascorbate and carotenoids and higher TEAC during storage. In accordance with these observations, lower ion leakage values were detected in 1-MCP-treated apricots. CONCLUSION: Taken together, these results suggest that 1-MCP conferred a greater resistance to oxidative stress. This, along with the reduction in ethylene production, could contribute to the increase in commercial life and nutritional value observed in 1-MCP-treated apricots. (C) 2010 Society of Chemical Industry