Abstract: The contents of membrane unsaturated fatty acids in longan leaves and the degree of unsaturation of the fatty acids were positively correlated with the cold-tolerance of the varieties. The contents of the unsaturated fatty acid in membrane lipid varied periodically with the change of season. The proportion of the membrane fatty acids in leaves indicated that there were genetic differences of cold tolerance among the varieties and it could be used as the index of cold-tolerance.

Key words: longan, leaf, membrane fatty acid, cold tolerance

摘要： 龙眼叶片膜脂不饱和脂肪酸含量和脂肪酸不饱和度与龙眼不同品种的耐寒性呈正相关;在年周期中,不饱和脂肪酸含量的变化与龙眼耐寒性的变化呈现平行关系;龙眼叶片膜脂脂肪酸组分含量反映着龙眼品种间耐寒性遗传上的差异,可作为耐寒性的鉴定指标。

关键词: 龙眼, 叶片, 膜脂脂肪酸, 耐寒性