Safoora Hashemi jokar - PhD student of Microbiology,Department of Microbiology,Karaj Branch,Islamic Azad University,Karaj,Iran
Mahmoud Shavandi - Assistant Professor of Molecular Genetics,Environment and Biotechnology Research Division,Research Institute of Petroleum Industry,Tehran,Iran
Azam Haddadi - Assistant Professor of Microbiology,Department of Microbiology,Karaj Branch,Islamic Azad University,Karaj,Iran
Ebrahim Alaie - Environment and Biotechnology research Division,Research Institute of Petroleum Industry,Tehran,Iran

Background and Aim : Pesticides and insecticides are the chemicals widely used in the agricultural industry, but their ecotoxicological effects on the environment is not still well understood. In this study, the impact of a pesticide, chlorpyrifos (CP) and an insecticide, deltamethrin (DM) as the organophosphorus and pyrethroid compounds on soil microbial diversity was investigated .Methods : four different soils samples under the various salinity (۰, ۱%, ۲% and ۴%) were contaminated by these compounds. Then, the destructive effects of CP and DM on the soil microbial composition were studied by next generation sequencing (NGS).Results : The results indicated that soil salinity had significant impact on the sample's resistance to the toxins and some of the dominant species in the blank sample were completely destroyed by CP and DM.At the phylum level ,Firmicutes and Proteobacteria were not be destroyed by DM and CP, but their population also were considerably raised by degrading the contaminantsConclusion : The present results provided a momentous insight into the environmental impacts of chlorpyrifos and deltamethrin contaminants and their natural attenuation.

Pesticides, deltamethrin, chlorpyrifos, next generation sequencing, Soil Salinity