2019 ASHS Annual Conference

The objective of this study was carried out to investigated the effects of 1-MCP treatment on phenotypic and genetic alterations of fruit quality in ‘Fuji’, ‘Hwangok’, and ‘Picnic’ apples during cold storage. 1-methylcyclopropene (1-MCP, 1 μL·L^-1) was applied for 18 hr after harvest and then stored at 0℃ during six months. Flesh firmness and titratable acidity (TA) of 1-MCP treated fruit were higher than control fruit during storage progressed, while soluble solids content (SSC) and weight loss were not affected. Notably, the flesh firmness, TA and SSC of ‘Hwangok’ and ‘Picnic’ apples were higher than ‘Fuji’ apple. Internal ethylene concentration (IEC) and ethylene production were highly increased by control fruits, compared with 1-MCP treated fruits. Furthermore, IEC and ethylene production of ‘Hwangok’ and ‘Picnic’ apples were lower than ‘Fuji’ apple. Total sugar content was higher in ‘Fuji’ and ‘Hwangok’ apples by 1-MCP treatment compared with control, but not in ‘Picnic’ apple. In uronic acid content, ‘Picnic’ apple by 1-MCP treatment was higher than control, but not in ‘Hwangok’ and ‘Fuji’ apples. 1-MCP treatment delayed the increase of all cell wall hydrolase activities in ‘Fuji’ apple, compared with control. However, activities of β-glucose (β-Glc) and α-manosidase (α-Man) decreased in ‘Hwangok’ apple and its of β-galactosidase, α-galactosidase, β-Glc, α-Man, and β-xylosidase decreased in ‘Picnic’ apple by 1-MCP treatment. The expression of ethylene biosynthesis ACO and ACS genes was significantly higher in control fruit than in 1-MCP treatment in three apple cultivars. The expression of ethylene signaling ETR gene was also higher in control fruit than in 1-MCP treated fruit in ‘Fuji’ and ‘Picnic’ apples, except ‘Hwangok’ apple. Financial support for this research was supported by a grant from 2018 Research Fund (PJ01382702) of Rural Development Administration, Republic of Korea.