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中度水分胁迫（１０％ ＰＥＧ处理４８ ｈ） 导致小麦幼苗叶片膜显著受损伤，表现为ＳＯＤ 活性降低和ＭＤＡ 含量明显升高。在胁迫期间外加水杨酸（ＳＡ） 并不能阻止叶片膜受损伤，但在小麦种子吸胀和萌发期间用ＳＡ处理的小麦幼苗， 同样强度的水分胁迫不会对细胞膜造成损伤，在这种情况下ＳＡ 对水分胁迫导致的膜损伤有保护作用。
Moderate water stress (10% PEG treatment for 48 h) caused significant damage to the leaf membrane of wheat seedlings, which showed the decrease of SOD activity and the increase of MDA content. Application of salicylic acid (SA) during stress did not prevent leaf membrane damage, but SA seedling wheat seedlings during the period of imbibition and germination of wheat seeds did not damage the cell membrane with the same intensity of water stress Under SA has a protective effect on the membrane damage caused by water stress.