磷脂酰甘油(PG)只占植物类囊体类脂的3%—5%,在冷敏感植物中,PG因具有较多的饱和脂肪酸(>5%),而决定了整个膜在零上低温下的相变,不同种间PG脂肪酸组成的差异来自3-磷酸甘油转酚酶三种同工酶之一(AT_1)的转酰基选择性差异.1992年Murata成功地将南瓜和拟南芥菜的AT_1基因分别转入烟草中,从而使烟草PG脂肪酸组成因转基因而改变.分别类似于南瓜和拟南芥菜的组成,转基因烟草的耐低温性同时亦因此而改变.至此自1972年以 Phosphatidylglycerols (PGs) account for only 3% to 5% of plant thylakoid lipids. In cold-sensitive plants, PG has the effect of having more saturated fatty acids (> 5%), , The difference in the composition of PG fatty acids among different species comes from the transacylation selectivity of one of the three isoenzymes (AT 1) of the 3-phosphoglycerol transpeptidase. In 1992, Murata successfully transferred the pumpkin and Arabidopsis thaliana AT_1 gene were transferred into tobacco, so that tobacco PG fatty acid composition due to genetically modified, respectively, similar to the composition of pumpkin and Arabidopsis, transgenic tobacco also has low resistance to low temperature so far since 1972