<正>分析了杨树杂种膜脂脂肪酸组分。不同无性系的膜脂脂肪酸配比存在着明显的差异。不饱和/饱和脂肪酸比值反映了膜脂脂肪酸不饱和的高低,与抗寒性成正相关。杨树杂种膜脂脂肪酸的不饱和度是受遗传控制的。以不同产地小叶杨为父本的杂种后代,膜脂脂肪酸不饱和度差异显著,Ⅰ-69杨×山西小叶杨为最高。不饱和的亚油酸(18∶2)与饱和的棕榈酸(16∶0)的比值作为杨树无性系抗寒指标是可行的。

This paper gives an analysis of the fatty acid component contents in the cell membrane of populus hybrids. The results of the analysis show there exist distinct differences in the proportion of fatty acid component contents among populus clones. The ratio of the unsaturated to saturated fatty acid in the cell membranci which shows the unsaturated level of fatty acid, is corelated positively with the ability of the frost resistance. The unsaturated level depends on the inheritance of different clones. More remarkable differences of the unsaturated fatty acid levels are found in the cell membrane of hybrid progenies of P. simonii (Shanxi) male parent; especially in the combination of P. deltoides cv. ’LUX’ (ex. I-69/55) × P. simonii (Shanxi). The paper considers that the ratios of linoleic (C18:2) to linolenic (C18:2)acid can be used as an index of the frost resistance of populus clones.