Influence of hydrogen peroxide on the ROS metabolism and its relationship to pulp breakdown of fresh longan during storage

The influence of hydrogen peroxide (H(2)O(2)) on the ROS metabolism and its relationship to pulp breakdown of fresh longan cv. Fuyan during storage was evaluated. Contrasted to control fruit, H(2)O(2)-treated samples manifested a higher index of pulp breakdown, an enhanced rate of O(2)(–.) generation, and an increased amount of MDA, but lower APX, CAT and SOD activities, reduced expressions of DlAPX, DlCAT and DlSOD, and lower concentrations of total phenolics, flavonoid, AsA, and GSH as well as lower levels of free radicals scavenging capacity. These data revealed that H(2)O(2)-induced pulp breakdown of longan was because H(2)O(2) reduced ability of removing ROS but increased ROS generation and accumulation, which promoted peroxidation of cell membrane lipid, and subsequently led to damaging cell membrane structure and breakdown occurrence in pulp of postharvest fresh longan.