Interactions of 1-MCP and low oxygen CA storage on apple quality.
DeEll J.R., Murr D.P., Wiley L., Mueller R.
5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p 44.
2004
บทคัดย่อ
Interactions of 1-MCP and low oxygen CA storage on apple quality.
The objective of this study was to investigate the interactions of 1-methylcyclopropene (1-MCP) and low oxygen controlled atmosphere (CA) storage on apple quality.‘Mclntosh’,‘Empire’, Gala’, and ‘Delicious’ apples harvested at optimum maturity were treated with 1 ppm or no 1-MCP at 0 °C for 24 hours.‘Mclntosh’ and ‘Empore’ apples were then placed into standard CA (3.0% O2 + 2.5% (30 days) then 4.5% CO2, and 2.5% O2 + 2.5% CO2 for ‘Mclntosh’ and ‘Empire’, respectively) at 2.5-3 °C, and four low oxygen regimes (1% and 0.7% O2, each with or without 0.7-1% CO2) at 2.5-3 °C or 0°C.‘Gala’ and ‘Delicious’ apples were also placed into standard CA (2.5% O2 + 2.5% CO2) and the low oxygen regimes, but only at 0 °C.Within specific CA regimes, apples treated with 1-MCP were 0.5-1 Kg firmer than comparable apples after 120 or 240 days of storage.Lowering the oxygen and the presence of CO2 did not consistently improve firmness, as many apples treated with 1-MCP exhibited the highest firmness regardless of gas concentrations during storage.Firmness of certain cultivars in specific CA regimes was influenced by 1-MCP, gas concentrations, and storage temperature.Ethylene, CO2 and volatile production were generally lower in apples treated with 1-MCP, held at lower temperature, and in low oxygen with CO2, although there were some interactions of these factors.Overall, 1-MCP reduced the incidence of superficial scald, but increased core browning and CO2 injury, and interacted with the CA regimes to influence internal breakdown.These results suggest that in combination with 1-MCP both standard and low oxygen CA recommendations require revision, as certain cultivars exhibited no further quality benefit from combining low oxygen with 1-MCP.