The activity of SOD and POD of fruit core and flesh of Whangkeumbae was lower than that of Yali pear, and the activity of SOD and POD of bagging yali pear was higher than that of unbagging Yali pear.

• 因此果心较果肉易褐变,鸭梨较黄金梨易褐变,并且低温和套袋能够延缓果实衰老,防止和减轻果心褐变。