Different Doses of Red Light and Ethephon Treatments on Postharvest Mangoes Ripening and Reactive Oxygen Metabolism
This study aimed to investigate the effects of different doses of red light irradiation and ethephon treat-ments on the ripening and reactive oxygen species metabolism of postharvest mangoes,and clarify the recommended dosage in ripening.Mangoes without any ripening treatments were used as control,and the 300 lx(RL-300)and 600 lx(RL-600)red light,400 mg/L(ETH-400)and 1 200 mg/L(ETH-1200)ethephon treatments were applied for ripening,respectively.Then the respiratory intensity,ethylene release,active oxygen contents and enzymatic and non-enzymatic scavenging abilities of fruits were determined,and the effects of different treatments on ripening and active oxygen metabolism of mangoes were analyzed,finally the suitable ripening method was screened.The results showed that RL-600 and ETH-400 treatments presented superior ripening effects on mangoes,maturing 4 days earlier compared to CK,increasing the peak values of respiration rates by 18％and 12％,the peak values of ethylene release by 7％and 17％,the peak values of hydrogen peroxide by 14％and 9.6％,which also improved the activities of ascorbate peroxidase,catalase and glutathione reductase and the contents of glutathione,and maintained the balance between reactive oxygen species(ROS)production and scavenging system.The ETH-1200 treatment accelerated the accumulation of ROS in mangoes.As the activity levels of ascorbate peroxidase and catalase were insufficient to remove H2O2,overripe rot occurred in mangoes after 6 days of storage.The ROS-related enzyme activities of mangoes in RL-300 treatment group were lower,resulting in the lower production and clearance levels of ROS,which could not promote mangoes ripening.In conclusion,RL-600 and ETH-400 treatments can effectively promote mangoes ripening,and the ROS generation and clearance system can maintain a balance.
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维普
