甲基叔丁基醚和Cd复合作用对小麦幼苗生理指标的影响

以小麦为试验对象,通过水培试验研究不同浓度的MTBE(0,5,10,50,100,200,300,400,500mg/L)和Cd(5mg/L)复合作用对小麦幼苗叶绿素含量、可溶性蛋白、抗氧化酶系统活性、MDA和游离脯氨酸含量的影响。结果表明:叶绿素含量和可溶性蛋白的含量随着MTBE浓度升高出现先增高后降低的趋势;抗氧化酶系统(SOD、POD)和游离脯氨酸的趋势是一致的,在MTBE浓度为400,500mg/L时,SOD酶活性与对照相比降低了17%,18%,POD酶活性降低了26.8%,27.8%;在MTBE浓度为200,300,400,500mg/L时,MDA含量与对照相比有显著差异(P<0.05),分别降低了27.5%,30.6%,34.9%,36.7%;游离脯氨酸的含量在MTBE浓度为200mg/L时高于对照62.3%。

Effects of Composite Function MTBE and Cd on the Physiological Indexes of Wheat Seedlings

Taking wheat for experimental object,though hydroponic experiment,the composite function of different dose of MTBE and Cd(5 mg/L) which have impact on wheat seedlings growth and several physiological indexes were studied.The results show that: The colorophyll content and soluble protein content increased first and down after,with the increase of the dose of MTBE;the trend of antioxidant enzyme system and free praline was the same,at the concentration of MTBE was 400,500 mg/L,the SOD was reduced 17%,18% compared with the control,and POD was reduced 26.8%,27.8%;at the concentration of MTBE was 200,300,400,500 mg/L,the content of MDA was significant difference compared with the control,and the percentage was 27.5%,30.6%,34.9%,36.7%;but the content of free praline was higher than the control at the concentration of 200 mg/L.