铯对青稞幼苗SOD和CAT活性的影响

Effects of Cs^+ on SOD and CAT Activities of Hordeum vulgare

以青稞三叶期幼苗为材料,分别用质量浓度为10.0、20.0、40.0、80.0和120.0 mg/L Cs^+(Cs Cl)处理1、3、6和10 d后,研究不同质量浓度Cs^+胁迫下青稞幼苗超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性的变化.结果表明:青稞幼苗在低质量浓度Cs^+的胁迫下,CAT和SOD活性随胁迫时间的延长而不断升高,达到峰值后,不断降低,整个曲线呈抛物线形;在高质量浓度Cs^+的胁迫下CAT和SOD活性呈线性下降,随染毒时间越长,CAT和SOD活性越低,表现出明显的抑制作用.所以,Cs^+对青稞幼苗具有较强的生理毒性,青稞CAT和SOD对Cs^+污染反应灵敏,可作为环境中Cs^+污染的监测指标.

The influence of Cs^＋ on activities of superoxide dismutase （SOD） and catalase （CAT） in Hordeum vulgare seedlings was investigated. Hordeum vulgare seedlings were treated with 10.0, 20.0, 40.0 80.0 and 120.0 mg/L Cs^＋ with various days. After 1, 3, 6 and 10 days treatments, respectively, activities of SOD and CAT were determined. The results showed that, activities of CAT and SOD increase at first with prolonged treatment under low concentrations of Cs^＋ , then decrease after reaching a peak. Both activity curves exhibit parabolic shapes. On the other hand, high concentration of Cs^＋ inhibits activities of CAT and SOD. Both activities line- arly decrease along with treating time. Overall, Cs^＋ reveals strong physiological toxicity to Hordeum vulgare seedling. Activities of CAT and SOD of Hordeum vulgare seedlings are sensitive to Cs^＋ pollution. Therefore, Hordeum vulgare seedling can be utilized as an indi- cator of Cs^＋ pollution in environment monitoring.