低温胁迫和变温处理对李子生理特性的影响

Study on Effects of Low-temperature Coercion and Temperature Change on Physiology Characteristics of Plums

研究了低温胁迫和变温处理对李子生理代谢的影响,揭示了李子冷害的生理特性和变温处理的影响机制,分析比较了间歇升温和逐步降温两种变温模式对控制李子冷害的效果。结果表明,-0.5～0℃对李子具有低温胁迫作用,冷害引起细胞膜透性快速增大,MDA含量的急剧上升,打破PGPE酶平衡系统,引起果胶质代谢紊乱。间歇升温即-0.5～0℃贮藏15d,升温至18～20℃保持1d,然后转回-0.5～0℃,如此重复,可抑制细胞膜透性的增大和膜脂过氧化程度的提高,维持PGPE酶代谢平衡,为最佳变温模式。

The effects of low-temperature and temperature change on physiology characteristics of`“Hei Hu Po”plums were studied.The effects of two temperature change patterns,that is,intermittent warming form 0～-0.5℃to 18～20℃every 15 days and decreasing temperature from 10 to -0.5～0℃in 10 days on chilling injury were presented with the -0.5～0℃constant low-temperature storage as control .The results showed that serious chilling injury took place in constant low-temperature storage and enhanced the increase of cell membrane permeability and MDA content,broke up PG and PE enzyme balance and disordered pectin metabolism. Intermittent warming was manifested to be a suitable pattern.