摘要
分析了水稻幼苗低温胁迫前后膜脂和膜脂脂肪酸含量变化。结果表明，经胆固醇处理的幼苗叶和根细胞膜脂中ＬＰＣ、ＰＳ和ＰＧ含量比对照下降少，ＰＡ含量增加也较少。胆固醇处理的幼苗叶和根棕榈酸（１６：０）增加量和亚麻酸（１８：３）与ＩＵＦＡ减少量均明显比对照少。试验结果证明，水稻幼苗叶片和根系的抗冷力与ＰＡ含量和脂肪酸不饱和程度变化有密切关系。外源胆固醇处理水稻幼苗能阻止低温对膜脂的破坏作用，提高幼苗抗低温胁迫能力。
The changes of membrane lipids and their fatty acids of rice seedlingswere measured before and after low temperature stress. The results indicated that whenthe rice seedlings were sprayed with cholesterol，then stressed by low temperature，thereductions of LPC，PS，PG，linolenic acid（18：3）and IUFA and the additions of PAand palmitic acid（16：0）were less than those of the control both in leaves and roots. This result suggests that the sensitivity of rice seedlings to cold stress is closely relatedto PA and their unsaturated fatty acids component．Treating with exogenous cholesterolnot only can prevent mernbrane lipids from chilling injuries but also enhance the cold re-sistance of rice seedlings.
基金
福建省自然科学基金
关键词
胆固醇
水稻
幼苗
膜脂
脂肪酸
抗冻性
Cholesterol，Membrane lipid，Fatty acid，Rice seedling，Cold resistance
