Effect Of Different Treatments On Postharvest Quality Of Iceberg Lettuce And Green Asparagus

Effects of different storage temperatures (0℃,10℃and20℃), l-methylcyclopropene(1-MCP), gibberellic acids (GA) and ethylene on postharvest quality of iceberg lettuce and effects of 1-MCP, GA, glutathione, ethanol on postharvest quality of asparagus were studied in this research.It was shown that the quality of iceberg lettuce was significantly improved by treatment with GA. After stored at 20℃ for 6d, the levels of soluble sugar (SG) and soluble protein (SP) in GA treated lettuce leaves was 41% or 23%, respectively, higher than that in control. The SG level in lettuce stored for 6d at 0 or 10℃ was 42% or 11.8% higher than that in control, and the SP level was 37% or 14%, respectively, higher than that in control.It was shown in the study that the postharvest quality of asparagus was significantly improved by treatment with GA, 1-MCP. The declinations in chlorophyll, SG and SP levels in asparagus were significantly retarded by treatment with GA. The chlorophyll or SP level in asparagus treated by ethanol was remarkably higher than that in control. The declining in SG or SP level was retarded by 1-MCP. The increasing in activity of polyphenol oxidase, peroxidase and level of free amino acids in asparagus were reduced by treatment of 1-MCP. Postharvest quality of asparagus was improved, at some extent, by treatment with ethanol or glutathione.