久效磷对三角褐指藻的毒性

THE TOXIC EFFECT OF MONOCROTOPHOS ON PHAEODACTYLUM TRICORNUTUM

久效磷对饵料单胞藻──三角褐指藻有严重的生长抑制作用。在其毒害下，三角褐指藻细胞的超氧化物歧化酶和过氧化物酶活性降低，活性氧在细胞内大量积累，膜脂过氧化作用加强，膜透性增大，细胞内的电解质大量外漏，细胞严重受害。研究表明：活性氧参加了久效磷对三角褐指藻细胞的伤害，并是抑制藻细胞生长的主要原因之一。

Monocrotophos could heavily inhibit the growth of Phaeodactylum tricornutum.During eary period of stress, algal cells were able to maintain higher activity of SOD and POD, less lipid peroxidation and normal membrane permeability. With the prolonged time of stress, activity of SOD and POD lowered, active oxygens accumulated much more, lipid peroxidation became stronger, membrane permeability eularged and a lot of electrolytes leaked. These indicated that active oxygens participated in the damage of monocrophos to phaeodactylum tricoenutum, and it was one of the main reason why monoctophos could inhibit algal growth.