中文摘要：

通过比较盐、冷、热激三种不同胁迫预处理后超级稻幼苗在低温伤害条件下含水量、过氧化氢酶（catalase，CAT酶）活性、同工酶谱、内源激素的变化，初步研究超级稻的适应性机制。结果表明，水稻幼苗经过不同胁迫预处理后，与未处理的对照苗相比。含水量有所提高；热激预处理苗CAT酶活性高于对照，而盐迫和低温则稍低于对照；同工酶谱变化各有异同，也有其独特性；冷处理苗的脱落酸（abscisic acid，ABA）含量高于对照，而热激处理苗ABA含量稍低于对照，三种预处理苗的赤霉素（gibberellin。GA3）、玉米素（zeatin。Z）、吲哚乙酸（indole-3-acetic acid，IAA）含量均高于未处理苗。

英文摘要：

The changes of the water contents,activities hormones in super rice seedlings with salt,cold and of CAT enzyme,POD isoenzyme zymograms and plant heat shock pre-treatment were measured in order to preliminary research on the mechanism of adaptation of super rice.By comparing with non-pretreated control （CK）,the water contents,the CAT activities of heat pre-treated seedlings were higher than CK. In contrast,the CAT enzyme activity of salt pre-treated seedlings and cold pre-treated ones were lower than CK.The POD isoenzymes zymograms were different and specific.The changes of the contents of ABA in salt and cold pre-treated seedlings were higher than CK,but the heat pre-treated seedlings were lower. The contents of GA3,Z, IAA in the three different pre-treated seedlings were higher than the non-pretreated ones.