中文摘要：

以“哈尼”草莓幼苗为试材，测定了外源水杨酸（SA）对草莓幼苗低温胁迫下的某些生理反应，以研究SA对植物抗冷性影响的生理机制。结果表明：适当浓度的外源SA能提高低温胁迫下草莓幼苗体内组织总含水量、组织水势和叶绿素含量，提高保护酶SOD、POD、CAT活性，降低质膜透性和MDA含量，并能改变脂肪酸各组分的相对含量，降低脂肪酸饱和度，增加脂肪酸不饱和度。认为外源SA能提高草莓的抗冷性，其机制可能与膜脂肪酸组分的变化有直接关系。

英文摘要：

＂Hani＂strawberry（ Fragaria × ananassa Duch. ）was employed to study the effect of salicylic acid on plant chilling tolerance and its mechanism. The results showed that the exogenous salicylic acid at appropriate concentrations increased the tissue total water content, water potential, chlorophyll content, and the activities of peroxidase, catalase and SOD. SA reduced the membrane permeability and MDA content, and altered the relative content of fatty acids, i.e. reduced the saturated fatty acids and increased the unsaturated fatty acids. It is proposed that exogenous salicylic acid can improve the chilling tolerance of strawberry and alteration of cell membrane fatty acids maybe involved in its mechanism.