THE CONTROL OF AYTOCATALYTIC ETHYLENE PRODUCTION AND RIPENING IN KIWIFRUIT BY TEMPERATURE AND CONTROLLED ATMOSPHERE STORAGE
Propylene was employed after harvest in order to study the effect of temperature and CA conditions in autocatalytic ethylene production in connection with ripening of kiwifruit "Hayward" kiwifruit was harvested at preclimacteric stage and treated with 130 μl.l-1 propylene kept in air or controlled atmosphere storage(5% CO2, 2% 02, 5% CO2+2% 02) at 0°, 10° and 20°C for 6, 55 and 200 days respectively. Internal ethylene concentration, flesh firmeness and soluble solids content were measured in various storage periods. Propylene administered at 20°C induced ethylene production in air treatment. Its ability to stimulate ethylene production and ripening was reduced by low oxygen (2%) and/or high carbon dioxide (5%) level. However, there was no autocatalytic ethylene production in low temperature of 10° or 0°C. Propylene at the concentration of 130 μl.l-1, which is equivalent to 1 μl.l-1 ethylene, caused ripening in fruit kept in air. The rate of fruit softening was dependent on temperature. Propylene induced ripening (firmness 1–2 kg) at 20°C in 4 days, at 10°C in 14 days and at 0°C in 60 days. Propylene was less effective to cause ripening of the fruit under CA conditions. Control fruit which was storaged in air without propylene showed no softening of the fruit at 20°C for 6 days and a pronounced delay in ripening at 10° or 0°C in comparison with the propylene treated fruit. Fruit stored in CA (5% CO2+ 2% 02) at 0°C without propylene or ethylene exhibited the best storage performance (200 days with firmness >1 kg).
Sfakiotakis, E., Ververidis, P. and Stavroulakis, G. (1989). THE CONTROL OF AYTOCATALYTIC ETHYLENE PRODUCTION AND RIPENING IN KIWIFRUIT BY TEMPERATURE AND CONTROLLED ATMOSPHERE STORAGE. Acta Hortic. 258, 115-124