【摘要】 研究了Azotobacter beijerinckiiC4对镉、乙草胺单独及其复合污染胁迫的应激反应.结果表明,单独施加镉或乙草胺对菌株超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和ATPase酶活性均有不同程度的诱导作用,污染物加入初期诱导作用显著,而后期效应则不明显.镉和乙草胺复合污染对菌株抗氧化酶酶活性的影响随污染物处理浓度和时间的不同呈现不同规律.复合污染对菌株SOD酶和ATPase活性的影响主要表现为协同效应,但最终与相应单因子下的酶活性水平渐趋于一致.不同浓度的复合污染物对CAT酶活性的影响最初表现为拮抗或协同作用,但最终则均呈现为拮抗效应.更多还原

【Abstract】 The activity response of the antioxidant enzymes of Azotobacter beijerinckii C4（G^-） following exposure to Cd²⁺,acetochlor and their associations was investigated.Results showed that activities of SOD,CAT and ATPase in the bacterium were induced positively and obviously by Cd²⁺ or acetochlor,especially at the beginning time after treatment.The associated pollution of Cd²⁺ and acetochlor had different impacts on the activity of the antioxidant enzymes with different concentrations and treatment time.SOD and ATPase activities by the associations appeared stronger than each of their single factor,and the activities were consistent with each of their single factor finally.It presented induced or inhibited actions on CAT activity by various concentration associations,and appeared inhibiting effect ultimately.更多还原