Preharvest 1-methylcyclopropene (1-MCP) treatment effects on quality of spot and strip picked ‘Gala’ apples at harvest and after storage as affected by postharvest 1-MCP and temperature conditioning treatments

采前 采后 1-甲基环丙烯 园艺 肉体 冷库 褐变 成熟 果园 化学 生物 植物 乙烯 生物化学 催化作用
作者
Franziska C. Doerflinger,Yosef Al Shoffe,Gilang Sutanto,Jacqueline F. Nock,Christopher B. Watkins
出处
期刊:Scientia Horticulturae [Elsevier BV]
卷期号:325: 112682-112682 被引量:2
标识
DOI:10.1016/j.scienta.2023.112682
摘要

'Gala' apples are susceptible to development of stem-end flesh browning and subsequently flesh browning (FB) throughout the fruit during storage. Factors causing the browning are not well understood. In this study, fruit were obtained from an orchard block either untreated or treated with preharvest 1-methylcyclopropene (1-MCP; Harvista™) at two different harvest dates, one week apart. Preharvest 1-MCP was applied 7 d before the first harvest. Based on the commercially acceptable red coloration (66%), fruit were spot picked at the first harvest date, stripped picked at the second harvest date, or the remaining fruit from the first spot pick harvested on the second harvest date. Fruit were then untreated or treated with 1-MCP after overnight cooling to 0.5 °C (no conditioning treatment) or 10 °C for temperature conditioning (10 °C for 7 d), followed by storage in 2 kPa O2/2 kPa CO2 at 0.5 °C for 6 months. Fruit were generally less mature when harvested at H1 (spot pick) than at H2 (spot or strip pick), and with preharvest 1-MCP than without, and had the lowest FB incidence after storage. The picking method did not affect fruit maturity or FB incidence, but strip picked fruit softened more in storage than selective picked fruit. Overall, FB incidence was reduced by 5.9-, 1.2- and 1.6-fold by preharvest 1-MCP, postharvest 1-MCP and by conditioning, respectively. IAD values (higher values reflect higher chlorophyll concentrations) at harvest were positively correlated with flesh firmness, and negatively correlated with FB incidence. Preharvest 1-MCP treatment and early harvest contributes to reduced risk of FB development during storage of 'Gala' apples.
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