种子引发提高小麦抗渗透胁迫能力的效应

种子经渗透势－０．８ＭＰａ或－１．２ＭＰａＰＥＧ－６０００处理后，抗旱性不同小麦（ＴｒｉｔｉｃｕｍａｅｓｔｉｖｕｍＬ．）“晋麦３３”和“８４Ｇ６”种子萌发率均有提高，种子电解质外渗率明显降低，种子萌发适应渗透胁迫能力提高，种子可溶蛋白质含量、ＰＡＬ和ＰＯＤ活性显著增加，“晋麦３３”种子ＣＡＴ活性增加，两品种幼苗ＰＡＬ、ＰＯＤ和ＣＡＴ活性也均有提高，但“８４Ｇ６”种子ＣＡＴ活性下降。

EFFECT OF SEED PRIMING ON IMPROVING RESISTANCE OF WHEAT TO OSMOTIC STRESS

Some physiological and biochemical changes in wheat seed or seedling from seed priming (treated with -0.8 MPa or -1.2 MPa PEG 6000) were studied.Reponses of wheat Jin 33 and 84G6 to osmotic stress were compared.The data showed that seed priming improved seed germination under osmotic stress,decreased seed electrode leakage,increased seed soluble protein content,enhanced activity of PAL and POD of Jin 33 and 84G6 seed,CAT of Jin 33 seed,and activity of PAL,POD,and CAT of both Jin 33 and 84G6 seedlings.Priming with -1.2 MPa PEG 6000 had a slightly stronger effect on seed,and Jin 33 gave a better response to PEG priming.Role of seed priming in improving plant osmotic resistance were discussed.