<正>分析了杜鹃两个不同抗寒性的栽培品种毛白杜鹃（ＲｈｏｄｏｄｅｎｄｒｏｎｍｕｃｒｏｎａｔｕｍＧ．Ｄｏｎ）和西洋杜鹃（Ｒ．ｈｙｂｒｉｄｕｍＨｏｒｔ．）叶片磷脂的主要组分和脂肪酸组成。杜鹃叶膜磷脂主要是磷脂酰胆碱（ＰＣ）、磷脂酰乙醇脂（ＰＥ）、磷脂酰甘油（ＰＧ）和磷脂酰肌醇（ＰＩ），脂肪酸组成主要是棕榈酸（１６０）、反式－３－十六碳烯酸（１６１（ｔ））、硬脂酸（１８０）、油酸（１８１）、亚油酸（１８２）、亚麻酸（１８３）。研究结果表明，叶片膜磷脂的脂肪酸不饱和度及磷脂酰甘油（ＰＧ）的饱和脂肪酸水平均与品种抗寒性相关。抗寒品种毛白杜鹃具有较高的不饱和脂肪酸／饱和脂肪酸比值，其ＰＧ的饱和脂肪酸水平Σ［１６０＋１８０＋１６１（ｔ）］低于不抗寒品种西洋杜鹃。

The fatty acid compositions in phospholipids isolated from the leaves of two varieties of azalea with different chillingresistance were investigated. The two varieties of azalea were Rhododen dron mucronatum G. Don and R. hybridum Hort. In the leaf phosphlipids of azalea, the major phospholipids classes were phosphatidylcholine (PC), phosphatidylethanlamine (PE), phosphatidylglycerol(PG) and phosphatidylinostitol (PI). The fatty acid compositions were 16∶0, 16∶1(t), 18∶0, 18∶1, 18∶2 and 18∶3. The results showed that both the degree of unsaturated fatty acid in leaf phospholipids and thd level of saturated fatty acid in PG were related to the chillingresistance. The ratio of the unsaturated/ the saturated in the leaf phospholipids from chillingresistant variety Snow Azalea was higher and the level of saturated fatty acids Σ[16∶0+18∶0+16∶1(t)] of PG from it was lower than those of R. hybridum Hort.