Internal ethylene concentrations in apple fruit at harvest affect persistence of inhibition of ethylene production after 1-methylcyclopropene treatment |
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| Institution: | 1. Council for Agricultural Research and Economics, Research Centre for Engineering and Agro-food processing (CREA-IT), via Venezian 26, 20133 Milan, Italy;2. University of Milan, Department of Agricultural and Environmental Sciences, Via Celoria 2, 20133 Milano, Italy |
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| Abstract: | Factors that affect the efficacy of 1-methycyclopropene (1-MCP) treatment of apples Malus sylvestris (L.) Mill var. domestica (Borkh.) Mansf.] include cultivar and maturity. In this study, ‘McIntosh’, ‘Cortland’ and ‘Empire’ apples were categorized by internal ethylene concentrations (IECs) at harvest, treated with 1 μL L?1 1-MCP, and the IECs of individual fruit followed at 30 d intervals during air storage at 0.5 °C for 90 d. IECs at harvest ranged from <0.5 μL L?1 to ≥100 μL L?1, 51 < 100 μL L?1, and 10 < 50 μL L?1 for ‘McIntosh’, ‘Cortland’ and ‘Empire’, respectively. 1-MCP treatment resulted in a decrease of IECs in fruit of all cultivars by day 30 after harvest. During subsequent storage IECs remained low in fruit with <1 μL L?1 at harvest, but in ‘McIntosh’, ‘Cortland’ increased in proportion to IECs at harvest, but not in ‘Empire’. The importance of initial IECs in fruit on the persistence of 1-MCP inhibition of ethylene production was confirmed in a further experiment, in which IECs in untreated and 1-MCP treated ‘McIntosh’ and ‘Empire’ apples were measured for up to 194 d. 1-MCP also decreased 1-aminocyclopropene-1-carboxylic acid (ACC) concentrations in fruit. The results of our study are consistent with the hypothesis that IEC modulates the sensitivity of climacteric fruit to 1-MCP. |
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| Keywords: | Ethylene ACC Apple 1-MCP |
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