Effects of 1-MCP on the Storage Characteristics and Expression Levels of Related Genes in ‘Caihong 1’ and ‘Mutsu’ Apple
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Abstract:
The effects of 1-MCP on the firmness, ethylene release rate, weight loss rate, volatile substances, and expression of genes related to ethylene biosynthesis and cell wall degradation of ‘Caihong 1’ and ‘Mutsu’ apple during storage were investigated. Compared with control treatment, 1-MCP treatment could significantly reduce the weight loss rate of the ‘Caihong 1’ fruit, delay the peak of ethylene release, and maintain high fruit firmness. The peak value of ethylene in the control fruit was 74.13 μL/(kg•h) on day 60 of storage, while that in the 1-MCP treated fruits was 41.61 μL/(kg•h) on day 90 of storage. Treatment with 1-MCP delayed the weight loss and ethylene release rate of ‘Mutsu’ apples during storage. By analyzing the expression of related genes, the expression levels of the ethylene synthesis genes, MdACO and MDACS-1, and cell wall degradation genes, MdPG and MdXTHB, were found to be significantly decreased in the 1-MCP-treated ‘Caihong 1’ fruit; however, only the expression of the cell wall degradation genes, MdXTHB and MdEXPA8, were inhibited in the ‘Mutsu’ fruits. In conclusion, 1-MCP can significantly reduce the ethylene release rate of the ‘Caihong 1’ fruit, delay fruit softening, and prolong the storage period of the fruit. Thus, 1-MCP is a suitable post-harvest preservation treatment for fruits of this variety.
