บทคัดย่องานวิจัย

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Quality management through respiration control.

Prange R.K., Delong J.M., Harrison P.A.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p40

2004

บทคัดย่อ

Quality management through respiration control. Postharvest quality deterioration is generally proportional to product respiration rate.The anaerobic compensation point (ACP) is the O2 concentration at which respiration rate, measured as CO2 production, is the lowest.If O2 concentration declines below this value, CO2 production increases due to increased anaerobic respiration.Therefore, it is desirable to keep the tissue at or just above the ACP to reduce plant tissue to its lowest respiration rate and allow it to survive longer.A goal of postharvest researchers has been the development of an acceptable method to determine the ACP. Previous research has focussed o­n measuring gases associated with the o­nset of anaerobic respiration, e.g., increases in ethanol, acetaldehayde or CO2.

Recently, we discovered that a rapid change in the fo parameter of chlorophyll fluorescence occurs between ca. 0 to 1.0 kPa O2, depending o­n the commodity.A system was designed that provides a very accurate continuous estimate of Fo (F-alpha) and trials around the world have confirmed this system can be used to store procuct at extremely low O2 concentrations for extended storage periods.To determine id this system is measuring the ACP, various fruits and vegetables were exposed to decreasing O2 concentration.As the O2 concentration declined towards 0%, CO2 declined to a minimum (ACP), followed by a sudden increase in both ethanol and CO2 as anoxia occurred.F-alpha increased simultaneously with the occurrence of the ACP and the o­nset of anoxia.When anoxia ended by re-introduction of O2, F-alpha returned to its previous low value.

These results confirm that F-alpha is non-destructively determining ACP and allowing chlorophyll-containing produce to be stored at its lowest, optimum respiration rate.Possible physiological explanations for a relationship between respiration-based ACP and photosythesis-based Fo (F-alpha) will be discussed.