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  • 1 Estonian Agricultural University Institute of Agricultural and Environmental Sciences Tartu Estonia
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The research was conducted with the apple ( Malus domestica ) cultivars Krameri Tuviõun and Talvenauding at the Estonian Agricultural University during 2003–2005. The aim was to study the effect of 1-methylcyclopropene (1-MCP) treatment (1 ppm, at room temperature, 24 h) on the biochemical content and physiological disorders of apples and on external quality after 4 months of storage. The apples were stored in a normal atmosphere at 2–5°C and 80–85% RH. In the first storage season 1-MCP treatment did not improve apple quality in general; only the peel background colour of treated apples remained greener. In the second storage season 1-MCP treatment influenced the biochemical content of the apples and improved apple quality: treated fruits were firmer (increase from 4.7 kg/cm 2 to 8.1 kg/cm 2 ) and contained more vitamin C; also, the SSC decreased and the loss of titratable acids was delayed. Consequently fruit spoilage decreased by 30%.

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