This study evaluated the effect of preharvest aminoethoxyvinylglycine (AVG) and postharvest 1-methylcyclopropene (1-MCP) treatments on ethylene production in association with fruit quality changes during ‘Geum Hwang’ peach ripening. 75 mg L⁻¹ of AVG solution was sprayed to peach trees 7 days before harvest, and 1 µL L⁻¹ of 1-MCP gas was fumigated to fruits at harvest. Untreated peaches were used as a control. All samples were stored for 12 days at 8 °C, and analyses were performed at 4-days intervals. In terms of fruit quality, ethylene production and respiration rate levels in control fruits were 52.1% and 42.2% higher than in AVG-treated fruits and 53.2% and 45.5% higher than in 1-MCP-treated fruits, respectively, at the end of the storage period. The titratable acidity and flesh firmness values were 18.2% and 24.6% higher after AVG and 18.3% and 29.5% higher after 1-MCP treatments than in control samples. On day 8 of storage, lower peel color L* (13.5%) and b* (29.7%) values and higher soluble solids content (6.1%) were observed after 1-MCP but not AVG treatment. However, the peel color a* value was not affected by any treatment. In molecular analyses, AVG and 1-MCP reduced the expression of genes, such as 1-aminocyclopropane-1-carboxylate (ACC) synthase (PpACS1), ACC oxidase (PpACO1), ethylene-response sensor (PpERS1), and ethylene-insensitive 3 (PpEIN3). Additionally, the AVG treatment decreased the expression of PpACS1 (28.6%) on day 4 and PpACO1 (11.2% and 20.5%) and PpERS1 (34.6% and 21.4%) on days 4 and 8 compared to the 1-MCP treatment. In conclusion, AVG and 1-MCP treatments extended the storability and maintained the quality of ‘Geum Hwang’ peaches, with AVG displaying a more significant inhibitory effect, particularly, on the ethylene-related gene expression levels.

本研究评估了采前氨基乙氧基乙烯基甘氨酸 (AVG) 和采后 1-甲基环丙烯 (1-MCP) 处理对乙烯产生的影响以及“Geum Hwang”桃成熟过程中果实品质变化的相关性。桃树采收前7天喷洒75mg·L ^-1 AVG溶液，采收时用1μL·L ^-1 1-MCP气体熏蒸果实。未处理的桃子用作对照。所有样品在 8°C 下保存 12 天，并以 4 天的间隔进行分析。在果实品质方面，对照果实的乙烯产量和呼吸速率水平分别比AVG处理的果实高52.1%和42.2%，比1-MCP处理的果实分别高53.2%和45.5%。储存期限。与对照样品相比，AVG 处理后的可滴定酸度和果肉硬度值分别高出 18.2% 和 24.6%，1-MCP 处理后的可滴定酸度和果肉硬度值分别高出 18.3% 和 29.5%。储存第 8 天，1-MCP 处理后观察到较低的果皮颜色L * (13.5%) 和b * (29.7%) 值以及较高的可溶性固形物含量 (6.1%)，但 AVG 处理后未观察到。然而，果皮颜色a *值不受任何处理的影响。在分子分析中，AVG 和 1-MCP 降低了基因的表达，例如 1-氨基环丙烷-1-羧酸酯 (ACC) 合酶 ( PpACS1 )、ACC 氧化酶 ( PpACO1 )、乙烯响应传感器 ( PpERS1 ) 和乙烯不敏感3（PpEIN3）。此外，与 1-MCP 治疗相比，AVG 治疗在第 4 天降低了PpACS1（28.6%）的表达，在第 4 天和第 8 天降低了PpACO1（11.2% 和 20.5%）和PpERS1（34.6% 和 21.4%）的表达。总之，AVG和1-MCP处理延长了'金黄'桃的耐贮性并保持了品质，其中AVG表现出更显着的抑制作用，特别是对乙烯相关基因表达水平的抑制作用。