高温胁迫对两个仙客来品种抗氧化系统的影响

Effects of high temperature stress on antioxidant system in two cyclamen cultivars

以昼22℃/夜17℃处理为对照,昼35℃/夜27℃的温度对2个仙客来品种(1011和1051)进行高温胁迫处理,测定了高温胁迫对仙客来叶片中抗氧化系统的影响。结果表明,高温处理后,2个仙客来品种的超氧化物歧化酶(SOD)活性均减弱,1011品种减幅小于1051品种;1011品种的过氧化氢酶(CAT)、过氧化物酶(POD)和抗坏血酸过氧化物酶(APX)活性均增强,1051品种除POD活性有所增强外,CAT和APX活性均减弱;1011品种抗坏血酸(A sA)含量升高,而1051品种下降。上述结果说明,1011品种较1051品种具有较高的酶性和非酶性活性氧清除能力。

Seedlings of two cyclamen （1011 and 1051） cultivars were stressed with high temperature （day 35 ℃/night 27℃）,the temperature for comparison was day 22 ℃/night 17 ℃,and the antioxidant system of cyclamen leaves were determined. The results showed that under high temperature stress ,the activities of superoxide dismutase （SOD） decreased in both cultivars,but the decrease in 1011 was less than that in 1051;the activities of catalase （CAT）,peroxidase （POD） and ascorbic acid peroxides （APX） increased in 1011 ,while the activities of CAT and APX decreased in 1051,though POD activity slightly increased. The content of Ascorbic acid （AsA） increased in 1011,but decreased in 1051. These results indicated that the ability to scavenge the active oxygen of enzyme and nonenzyme system in 1011 was better than that in 1051 under high temperature stress.