Abstract
Ethylene production of‘Jonagold’apple (Malus domestica Borkh.) at an immature stage (60 to 140 days after full bloom (DAFB)) remained at low level until the fruits matured (150 DAFB) and over. The rate of C2H4 production increased dramatically in the harvested fruit (150 DAFB) kept at 20°Cand 90-95% RH, peaking at harvest+20 days. Thereafter, C2H4 evolution declined rapidly as the fruit began to senesce. The respiration rate of whole fruit showed a typical pattern of a climacteric fruit during its maturation.The activities of ethylene-forming enzyme (EFE) in peel and pulp were very low during the early growth period. Increases in EFE activity were detected between 130 and 160 DAFB and conspicuously observed in the harvested fruit kept at 20°Cfor 20 days. The peel consistently showed greater EFE activity than did the pulp. ACC contents of peel and pulp during the fruit growth and maturation on the tree were low compared to levels during the post-harvest period. Trends in ACC content paralleled those of EFE activity and C2H4 production.
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