Mechanism of 1-MCP-induced Resistance to Grey Mold in Postharvest Apples
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Abstract:
The effect of 1-methylcyclopropene (1-MCP) treatment on postharvest gray mold in apples and its mechanism were investigated. “Red Fuji” apples were used as the test materials and treated with 1 μL/L 1-MCP; apples without 1-MCP treatment were used as controls. After being allowed to stand at room temperature for 24 h, the samples were inoculated with a conidial suspension of Botrytis cinerea. The results showed that 1-MCP treatment effectively limited the lesion diameter of gray mold rot and significantly reduced the incidence of Botrytis cinerea compared to the control,. After five days of storage, the disease incidence of 1-MCP-treated apples was only 58.24%, which was significantly lower than that of the controls (90.73%). At the end of storage, the disease incidence in the treatment group was less than 70% and the lesion diameter of gray mold rot was 37.19 mm, while Botrytis cinerea occurred in nearly all apples in the control group and the lesion diameter expanded to 50.80 mm. Therefore, 1-MCP effectively inhibited the development of apple gray mold. Moreover, the activities of phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO), peroxidase (POD), β-1,3-glucanase, and chitinase of apple fruits were increased remarkably by 1-MCP, and the synthesis and accumulation of total phenolic compounds, flavonoids, and lignin were also increased, thus enhancing the disease resistance in fruits. These findings provide a theoretical basis and technical reference for studies of the application of 1-MCP in control of postharvest diseases of apples.
