Abstract: This experiment studied the effects of exogenous ethylene of different concentrations(10～20μl/L, 50～80μl/L) on the quality of" Bayuecui"peach fruit during CA storage(9%～11% CO2+9%～11% O2)and then 3 days shelf-life at 20 ℃. The results showed that the treatments with exogenous ethylene could make peach fruit softening normally, however, the firmness of peach fruit which were stored in controlled atmosphere without exogenous ethylene and in low temperature appeared harden, and lost the ability of normal softening even at 20 ℃ at the late period of storage. The treatments with exogenous ethylene promoted the increasing of membrane permeability of peach fruit during storage and shelf-life. Exogenous ethylene increased the total sugar content of peach fruit in the late period of storage, but did not affect the total sugar content obviously at 20 ℃ for 3 days. The treatments of exogenous ethylene accelerated the decreasing of titratable acids content in the middle stage of storage, while slowed down the rapid decreasing of titratable acid content during the shelf-life. The above results indicated that the effects of exogenous ethylene on the quality of peach fruit stored in controlled atmosphere manifested in the middle and late period of storage. Considering the comprehensive effects of different ethylene concentrations on all quality of peach fruit, we believed the treatment with 50～80μl/L exogenous ethylene has better effection.

Key words: peach fruit, controlled atmosphere storage, exogenous ethylene, quality