多氯联苯对蛋白核小球藻和斜生栅藻生长影响的研究

PCB1 2 54 对蛋白核小球藻Cholrellapyrenoidosa和斜生栅藻为Scenedesmusobliguus 2种藻类的生长有比较明显的影响 ,在低质量浓度时 (<0 4ng mL)有轻微的刺激作用 ,高质量浓度 (>2 0ng mL)时表现明显的抑制作用。 2种藻类的生长 96h有效半抑制质量浓度 (EC50 )分别为 7 73和 2 1 6 2ng mL。在PCB1 2 54 作用下 ,蛋白核小球藻和斜生栅藻的两种抗氧化关键酶 :超氧化物歧化酶 (SOD)与过氧化物酶 (POD) ,均有较明显的变化 ,在低质量浓度作用下 ,2种酶活性都略有升高 ;高质量浓度时明显受抑制 ,活性逐渐下降。其中SOD对PCB1 2 54 作用更为敏感。不同藻类对PCB1 2 54 作用响应不一样 ,其中斜生栅藻表现出对PCB1 2 54 更好的耐受性

The Effects of Aroclor 1254 on the Growth of Chlorella pyrenoidosa and Scenedesmus obliquus

The results showed that PCB 1254 had evident effects on the growth of two algae species(Chlorella pyrenoidosa and Scenedesmus obliquus).Soft stimulation effect appeared in lower concentration and strong inhibition effect in higher concentration. The EC 50 upon Chlorella pyrenoidosa and Scenedesmus obliquus was 7.73 ng/mL and 21.62 ng/mL respectively. The superoxidase(SOD) and peroxidase(POD) in two algae also related to the PCB 1254 to some extent. The activity of two enzymes rose lightly with the increase of concentration of PCB 1254 but droped distinctly in higher concentrations. Of that, the SOD showed more sensitive to PCB 1254.Scenedesmus obliquus showed stronger resistance than Chlorella pyrenoidosa \%to PCB 1254.