4 During the post-harvest storage period of Yali pear and Whangkeumbae, the relative electric conductivity had increased, and accumulated a large quantity of malonaldehyde (MDA), especially fruit core.

• 4 鸭梨和黄金梨采后随贮藏期的延长,果实相对电导率增大,MDA大量积累,且果心MDA含量最大。