摘要： 观察了经水杨酸（SA）预处理的黄瓜幼苗对低温胁迫的反应。结果表明，SA预处理明显增强了黄瓜幼苗的耐低温能力，萎蔫率、死亡率明显下降；幼苗的MDA含量略有增加，O₂^-含量下降；POD、SOD活性上升，CAT活性下降。黄瓜幼苗在低温胁迫过程中，经SA预处理的幼苗较未预处理幼苗MDA含量增加较少，O₂^-含量上升延迟，POD、CAT、SOD活性均比未进行SA预处理的幼苗活性高。试验表明，保持较高的膜保护酶活性是SA提高黄瓜幼苗耐低温能力的基础。

关键词: 黄瓜幼苗, 低温, 水杨酸

Abstract: Chilling resistance of cucumber(Cucumis Sativus L.)pre-treated with salicylic acid(SA)was measured,activities of the membrane-protective enzymes and content of superoxide anion(O2.-)were also determined. Resistance of chilling increased much more after SA pre-treated,and both the wilting rate and the death rate decreased.3 days after SA pre-treatment,contents of malondialdehyde(MDA)and O2.-decreased,activities of peroxidase(POD) and super oxidase(SOD)increased,that of catalase(CAT) decreased.After chilling treatment,contents of MDA and O2.-increased less in seedings of SA pre-treated than that in seedlings of SA non-pretreated.And activities of the POD,SOD and CAT were higher in SA pretreated seedlings than that in SA non-pretreated seedings.It indicated that activities of membrane-protective enzymes kept higher were the main cause to chilling resistance of SA pretreated cucumber.

Key words: Cucumber seedling, Chilling, Salicylic acid

中图分类号: 

• S642.201