Influences And Mechanism Analysis Of Dechlorane Plus In Ulva Pertusa Larvae Development

Dechlorane plus (DP) has been used as an amount of additive flame retardant. DP has toxic effects on the subject in individual, cellular, molecular level. DP has been identified as a high production volume (HPV). DP can enter the water inevitably and Ulva pertusa is a large common intertidal algae in China, the effects of environment in its spore form, diffuse, adhesion and growth of shoots are likely to have an impact on the amount and the distribution of U. pertusa adult in intertidal zone. Therefore, we use U. pertusa shoots as experimental subject in the process of spore formation rate, emission rate, adhesion rate, shoots’ growing, the efficiency of photosynthesis, oxidative stress to analyze the biological effects and functional impairments,in order to study the aquatic ecological risk of DP at a population level.The main obtained results were as follows:(1) DP exposure could affect development and reproduction of U. Pertusa. 10-6mol/ L DP exposure for 14days caused significant reduction of spore formation rate and spore emission rate, adhesion rate was inhibited with 10-7-10-6mol/L DP. In the three indicators, the adhesion rate was the most sensitive for the DP toxicity.(2) 10-8-10-6mol/L DP exposure for 14 days caused the significant reduction of U. Pertusa shoots’length.(3) 10-8-10-6mol/L DP exposure caused the significant reduction in Fv/Fm,Yield, ETR,and there was a significant increase in NPQ at the same concentration. There were time-and dose-dependent between four parameters and DP exposure.(4) CAT activity and MDA content were induced significantly in exposure of DP at 10-8-10-6mol/L,and there was a dose-dependent.10-7-10-6mol/L DP exposure caused time-dependent in CAT and MDA activity. At the same time,SOD activity increased and then decreased with exposure time.There was a significant difference between 10-8-10-6 mol/L DP treated groups and the control groups.In summary,DP inhibits spore reproduction and growth of shoots.we presume the possible mechanisms for DP may via inhibition of photosynthetic efficiency and oxidative stress of shoots.