Effects of 1-Methyleyelopropene and Ethylene Treatments on the Respiratory Metabolism and Cell Structure of Postharvest Zizania latifolia
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Abstract:
In order to explore the possible mechanism of postharvest senescence in Zizania latifolia, the effects of 10 μL/L 1-methyleyelopropene(1-MCP) and 1.25 mg/L ethylene(ET) treatments on the respiratory metabolism and cell structure associated with senescence in Z. latifolia stored at 25 ℃ for 6 days were investigated. The results showed that the 1-MCP treatment significantly inhibit ed the increase of L, a*, b* value and weight loss of Z. latifolia, whilethe respiratory intensity and reducing sugar content were significantly lower than those in the control. The superoxide dismutase (SOD) activity in samples treated with 1-MCP was significantly induced after 1 day storage but reduced its activity during the remainder storage period. 1-MCP treatment also promoted the cytochrome c oxidase(CCO) activity, while inhibited succinatedehydrogenase (SDH) and peroxidase(POD) activities compared with the control, which resulted in a relatively low relative leakage rate and malondialdehyde(MDA) content. After 6 days storage at 25 ℃, the integrity of cell structure was still maintained. Compared with 1-MCP treatment, ET treatment had the opposite effects on respiratory and reactive oxygen species(ROS) metabolism. These results suggested that 1-MCP treatment could significantly inhibited the respiratory metabolism and ROS production, maintained the energy metabolism balance and cell structural integrity, and then retard the postharvest senescence of Z. latifolia.
