镉离子胁迫下4种辣椒超氧化物歧化酶-同工酶酶谱及酶活性分析

以4种辣椒为材料,分析在不同胁迫浓度和胁迫时间镉离子胁迫下,4种辣椒超氧化物歧化酶(SOD)活性及同工酶酶谱的变化.结果表明,镉离子能显著影响酶活性的变化,不同镉离子浓度胁迫下不同材料酶活性变化不同, SOD酶活性最高为对照组的1.4倍(1号品种,100 mg/L胁迫3 d),酶活性最低的为对照组的60%(2号品种,150 mg/L胁迫6 d);镉离子还能影响同工酶酶谱,不同胁迫时间和浓度对同工酶的影响不同,对1号材料的影响最为显著,能诱导出2条SOD同工酶新谱带.

Catalytic Activity and Isozyme Patterns of Superoxide Dismutase in Four Species of Capsicums under Cd2+ Stress

Catalytic activity and isozyme patterns of superoxide dismutase (SOD) were studied in four species of capsicums at different times under series concentration of cadmium (Cd). The results show that Cd²⁺ can affect catalytic activity of SOD remarkably and dissimilarly according to its concentration. The highest catalytic activity is 1.4 times higher compared to the control (No.1 species, 100 mg/L for 3 d) while the lowest is only 60% of that of control
(No.2 species, 150 mg/L for 6 d). Besides, Cd²⁺ can also affect isozyme patterns of SOD, especially in No.1 species. Two new isozyme bands are induced.