Abstract:
In order to compare the effects of fludioxonil treatment with different concentrations on the refrigerated quality of pomegranate fruits, Taishanhong pomegranate fruits were treated with 200 mg/L(T1), 400 mg/L(T2) and600 mg/L(T3) concentrations of fludioxonil, respectively, then stored at(5±1) ℃ and RH 90%~95% for 112 days.Fruits quality related index of pomegranate were determined every 28 days during cold storage. Results showed that different concentrations of fludioxonil treatment had no significant effect on contents of total soluble solids(TSS),titratable acids(TA), ascorbic acid(AsA) and total phenolic(TP), color index of the pericarp and seeds of Taishanhong pomegranate fruit during cold storage. Higher concentration of fludioxonil delayed the onset of POD activity peak in pericarp during cold storage. Fludioxonil treatment accelerated the passivation of PPO during the cold storage to some extent. The total antioxidant activity(T-AOC) level of pomegranates in T2 group was significantly higher than that in T1, T3 and the control group on the 28th day of storage. Browning index of pomegranates in T3 group was the lowest(0.16) on the 112th day of storage, followed by T2 group(0.25), both were significantly lower than those in T1group(0.30) and in control group(0.31). In conclusion, the browning of the pomegranate fruit decreased with the increase of the fludioxonil concentration. In the later period of refrigeration, and fludioxonil treatment had no significant effects on the main physiological indexes of the fruit during cold storage. The treatment with 400~600 mg/L fludioxonil had a better effect to reduce the browning in the late period of Taishanhong pomegranate.