Abstract
Bananas are climacteric fruits and exhibit climacteric patterns in both their ethylene (C 2H 4) production and respiration rates during ripening. Treatment with C 2H 4 accelerated the ripening process, as indicated by colour changes. Gamma irradiation of green bananas, at doses of 0.4 kGy or greater, resulted in extensive tissue damage, undesirable colour development and changes in respiration and C 2H 4 production. However, irradiation at 0.2 kGy with a dose rate of 7.35 kGy h −1 effectively delayed ripening of the fruit by decreasing its sensitivity to its own endogenous C 2H 4 without causing any phytotoxicity. Irradiation at this dose did not affect ripening using high concentrations of exogenous C 2H 4.
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