随气温下降大头茶膜脂脂肪酸组分及膜保护系统的适应性变化

THE ADAPTIVE CHANGES OF MEMBRANE FATTY ACID COMPOSITION AND MEMBRANE PROTECTIVE SYSTEM OF GORDONIA ACUMINATA ACCOMPANIED WITH THE TEMPERATURE DECREASE

本实验以自然生长的大头茶为材料，研究了其叶片膜脂脂肪酸组分及膜保护系统随气温下降的变化。结果表明，膜脂脂肪酸不饱和度增加；同时，ＳＯＤ活性增强，Ｖｃ含量增加，ＰＯＸ出现了新的同工酶谱带，而使保护系统清除自由基的能力增强。这两方面的变化有着密切的关系，且都与大头茶的抗冷性发展相适应。

The changes of membrane fatty acid composition and membrane protective system of G.acuminata leaves as the temperature decreases were investigated.The results showed an increase of the unsaturation of membrane fatty acid,and an increase of the SOD activity as well as Vc content.and new isozymes of POX appeared.These strengthened the protective system's ability to sweep away the free radical.The results suggest that changes of unsaturation of membrane fatty acid are closely related with protective system,and are adapted to the chilling resistance development in G.acuminata.