【摘要】 试验通过测定在不同光照强度的紫外光照射后,浮萍的过氧化氢酶和过氧化物酶活性的大小来探究一下UV-B辐射增强对浮萍过氧化氢酶和过氧化物酶可能产生的影响.实验设置5个辐射强度,结果表明:在辐射梯度范围内,过氧化氢酶符合低促高抑效应;短时间UV-B辐射处理使过氧化物酶(POD)活性减弱,而较长时间紫外辐射处理后POD活性有所增加,并在辐射处理20 h后达到一个峰值,这可认为是浮萍适应UV-B辐射胁迫的一种策略行为,最长辐射时间处理后过氧化物酶活性又明显降低.更多还原

【Abstract】 The experiments aim to explore the possible effects on catalase and peroxidase by measuring the catalase and peroxidase activities of Lemna minor that exposed to different light intensity of UV-B.The experiments set five radiation intensity,the results indicate that within the scope of different radiation intensity,the catalase activity changed from activation to inhibition with treatment intensity increasing;peroxidase activities tended to decline in the short time treatment,then a little increased,and reached the maximum volume of POD activities,this could be explained to adaptation of Lemna minor on UV-B radiation,and peroxidase activity decreased evidently after the longest time treatment.更多还原