Effects of BDE3 on SOD, MDA andGSH of Perna viridis

To study the variation trends of superoxide dismutase (SOD) activity, malondialdehyde (MDA)level and glutathione (GSH) content in tissues of mantle and visceral mass of Perna viridis, we performed an experiment under semi-static conditions by exposing the samples to BDE3 (1 gL-1, 10 gL-1 and 100 gL-1) for 1 d, 3 d, 7 d and 15 d then releasing them by clean seawater for 3 d and 7 d. The results show that during the exposing period, SOD activities of the 2 tissues in 1 gL-1 group were induced very significantly (P0.01), and the induction rate decreased with exposing time; SOD activity of mantle in groups of 10 gL-1 and 100 gL-1 were more sensible than those of visceral mass. MDA level increased at first then inhibited later in mantle, while induction and inhibition alternated in visceral mass; for 1 gL-1 group, the highest induction rate reached 26.04% on 3rd day of exposing while the highest inhibitory rate reached 14.92% on 7th day. GSH content in mantle in 1 gL-1 group was induced significantly (P0.01) all the time, while it increased at first then inhibited later for groups of 10 gL-1 and 100 gL-1; in visceral mass, GSH content in 100 gL-1 group was induced significantly (P0.01) on 1st day, while that in 1 gL-1 group increased significantly with exposing time (P0.01); groups of 10 gL-1 and 100 gL-1 showed irregular trends of induction-inhibition. After the releasing period, only individual groups recovered to the same level in the control.