Effects of CO2 on Ethylene Production by Apples at Low and High O2 Concentrations

Ethylene, an endogenous plant growth regulator, plays a central role in the ripening of fruit (Biale and Young, 1981). The control of ethylene production is an important aspect of the commercial storage of fruit. The retardation of fruit ripening by raised levels of CO2 is generally attributed to its inhibitory effect on ethylene production and/or action. The process by which CO2 may inhibit production of ethylene is still unknown. The effect of CO2 has generally been studied at reduced 02 levels (Kader, 1986). The present study reports on the effect of CO2 on the biosynthesis of ethylene in “Jonathan” apples during controlled atmosphere (C.A.) storage at low and high O2 levels.