Abstract
The present paper deals with some observations on the effects of gamma radiation on the changes of respiratory rates, ethylene production, some organic acids, protein and RNA contents during the ripening of Bartlett pears. Irradiation delayed the onset of the respiratory rise and the ethylene production in the climacteric. Control samples required 4 days to reach the peaks of CO2 and C2H4 prodution, respectively. The 250 Krad-fruits required 9 days to reach the peak of CO2 production, and 7 days of C2H4 production. The fruits irradiated with a dose of 1000 Krad showed no increase of CO2 and C2H4 production in climacteric and failed to ripen. Effects of addition of malate on CO2 output of sliced tissue declined in the irradiated samples.The malic and citric acids decreased more in irradiated fruits than in control during ripening. Succinic acid slightly accumulated in the fruits irradiated with a dose of 1000 Krad. The protein N of pears during ripening slightly increased. A dose of 250 Krad, however, suppressed the increasing rate for a few days, followed on the 11th day by recovery to about the level in the control, and there was no recovery in a similar period after irradiation at a dose of 1000 Krad. Total RNA contents of fruits in both the control and the irradiated with a dose of 250 Krad also increased slightly, but it decreased with a dose of 1000 Krad.
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