【摘要】 耐热性不同的２个大白菜品种经３８℃高温胁迫后Ｏ－２含量明显增加，但耐热的亚蔬１号增幅远小于不耐热的“１０６”品种．高温胁迫使亚蔬１号的超氧物歧化酶（ＳＯＤ）、过氧化氢酶（ＣＡＴ）和抗坏血酸过氧化物酶（ＡＳＰ）活性提高，“１０６”品种除ＣＡＴ活性稍有提高外，ＳＯＤ和ＡＳＰ活性均下降．２个品种还原型谷胱甘肽（ＧＳＨ）含量增加不明显，但亚蔬１号仍稍高于“１０６”品种；抗坏血酸（ＡｓＡ）含量均减少，亚蔬１号降幅小于“１０６”品种．结果显示，在高温胁迫下，亚蔬１号较“１０６”品种具有较高的酶性和非酶性活性氧清除能力更多还原

【Abstract】 After 2 Chinese cabbage cultivars with different heat tolerance were stressed at 38℃,the O-2 content increased obviously, but much less in heattolerant Yashu No.1 than in heatsensitive “106”.Under high temperature stress,the activities of superoxide dismutase (SOD), catalase (CAT) and ascorbic acid peroxidase (ASP) increased in Yashu No.1,while the activities of SOD and ASP decreased in “106”, though CAT activity slightly increased.The content of glutathione reduced form (GSH) in 2 cultivars did not increase much,but the increase in Yashu No.1 was a little more than that in “106”. Ascorbic acid (AsA) content decreased in both cultivars,but the decrease in Yashu No.1 was less than that in “106”. The results showed that the ability to scavenge the active oxygen of emzyme and nonemzyme system in Yashu No.1 was greater than that in “106” under high temperature stress.更多还原