低温胁迫下不同防冻剂对梨幼果膜质过氧化的影响

为了解决由于梨花期前后经常发生的霜冻给果农带来的意外经济损失，以黄金梨子房膨大期幼果为试材，研究了3种防冻剂处理对低温胁迫（温度-2.9℃，时间0 h、1 h、2 h、3 h、4 h）下幼果的相对电导率、MDA含量、POD和SOD活性的影响。结果表明：经1~4 h的低温处理后，3种防冻剂处理的相对电导率和MDA含量均低于对照；而各处理的POD和SOD活性均明显的高于对照。说明各防冻剂处理对减轻幼果在低温胁迫时的膜质过氧化均有一定的效果，其中以‘天达2116’和‘必博PBO’处理的综合效果较好。

Effects of Different Kinds of Antifreezes on Membrane Lipid Peroxidation of ‘Whangkeumbae’ Pear Fruitlet Under Low Temperature Stress

In order to solve the economic loss to farmers caused by frost before or after pear blossom,the effects of 3 kinds of antifreezes treatments on the activities of POD and SOD,relative conductivity and MDA content of the ＇ Whangkeumbae ＇ pear ovaries（fruitlets） under low temperature stress（temperature-2.9℃,time 0 h,1 h,2 h,3 h,4 h） were studied.The results showed that：relative conductivity and MDA content of the fruitlets treated with different antifreezes were lower than that in the control via 1-4 h low temperature treatment;and the activities of POD and SOD in all the treatments increased rapidly and higher than that in the control.The data suggested that the tested antifreezes in this research could decrease the membrane lipid peroxidation level under low temperature stress,and the ＇ PBO ＇ and ＇ Tianda 2116 ＇ showed much more effective work.