Fruit fluorescence response to low oxygen stress: modern storage technologies compared to 1-MCP treatment of apple.
Zanella A., Cecchinel M., Coser M., Cazzanelli P., Panarese A., Rossi O.
5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.68
2004
บทคัดย่อ
Fruit fluorescence response to low oxygen stress: modern storage technologies compared to 1-MCP treatment of apple.
A non-destructive monitoring system (HarvestWatchTM; Satlantic Inc., Halifax, N.S., Canada) that assesses the low-oxygen stress of chlorophyll containing fruit, was applied during storage.It allows to adapt the atmospheric composition in the CA-room to the actual physiological state of the fruit, incontrast to the usual static conditions of CA-storage.Decreasing the oxygen concentration to the lowest tolerated levels by the fruit should enable to obtain the maximum benefits of ULO storage without the risk of losses caused by anaerobic conditions.The monitoring system is based on the measurement of the chlorophyll fluorescence by the means of FIRMTM (Fluorescence Interactive Response Monitor, Satlantic Inc.) sensor on samples of 6 apples each.A central computer is collecting on-line the fluorescence data.Below a fruit-specific oxygen-threshold the theoretical estimate of FO increases.The oxygen concentration of the controlled atmosphere was set close above the tolerance level of the fruit, determined by the rise of FO.The effects on quality preservation on apple fruit of three different maturity stages were compared with optimal CA-conditions and with 1-MCP postharvest treatment.The delay of quality loss was determined in terms of internal quality, by firmness, total soluble solids content and titratable acidity; of degreening; and of physiological disorders, like superficial scald, core flush, anaerobic breakdown.In the case of ‘Granny Smith’, according to the fruit’s fluorescence response to low oxygen stress, O2 was set at 0.4 kPa.After 6 months of storage and 7 days shelf-life at 20°C, no signs of low oxygen disorder were observed.The occurrence of scald was significantly reduced and better firmness was maintained, compared to conventional CA storage.