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Fusarium species are increasingly detected as the causal agents of decay of stored apple fruits. Fusarium avenaceum is particularly significant due to its predominant occurrence among Fusarium species in stored apple fruits and its ability to produce mycotoxins. Treatments with 1-methylcyclopropene (1-MCP) and different storage conditions affect the aggressiveness of F. avenaceum and development of fungal-caused decay in stored apple fruits. In this study, apple fruits (cv. ‘Granny Smith’) were treated with 1-MCP, and artificially inoculated with F. avenaceum. The isolate used for inoculation, originating from apple fruit, was identified based on morphological characteristics and by polymerase chain reaction (PCR) using a species-specific primer pair (FA-ITSF and FA-ITSR) for F. avenaceum. After inoculation, treated and untreated fruits were stored at room temperature and cold-stored under dynamic controlled atmosphere (DCA). Diameters of necrotic lesions were measured after 7, 14 and 21 days of incubation on fruits stored at room temperature, while necrosis diameters on DCA-stored fruits were measured immediately at the end of storage period (143 days), and after 7, 14 and 21 days of additional incubation at room temperature. The results show that treatment with 1-MCP inhibits the development of F. avenaceum on apple fruits during storage under DCA. However, after storage, i.e. during incubation at room temperature, no significant difference between 1-MCP-treated and untreated fruits was observed. On fruits stored at room temperature only, no difference between 1-MCP-treated and untreated fruits was observed. However, 1-MCP-treated fruits stored at room temperature only developed significantly smaller necrosis lesions compared to 1-MCP-treated and DCA stored fruits. It infers that both 1-MCP treatment and DCA storage inhibit fungal decay caused by F. avenaceum on apple fruits. However, the effects do not persist after storage.

Effects of 1-MCP and dynamic controlled atmosphere on apple fruit rot caused by Fusarium avenaceum