Background: This research was conducted to evaluate the effect of Piriformospora indica (P.indica), drought, and soil salinity stress on diesel oil biodegradation in a soil that was polluted with Pb and Cd. Methods: Treatments consisted of corn inoculated with P.indica and white clover intercropping system under the salinity (۳.۱ and ۶ dS/m) and drought (normal and intensive) stress which cultivated in the Pb and Cd polluted (naturally) soil which simultaneously contaminated with diesel oil at the rates of ۰ and ۴ % (W/W). After ۱۰ weeks, plants were harvested and the diesel oil biodegradation in the soil was determined. In addition, the soil microbial activity, the APX and POX enzyme activates were measured. Results: Diesel oil biodegradation significantly increased in the soil under cultivation of plants inoculated with P.indica, while it significantly decreased under salinity and drought stress by ۱۲.۹ and ۹.۸%. However, the intercropping system had positive effects on increasing the soil microbial activity and biodegradation of diesel oil in the soil. Conclusion: Corn inoculation with P.indica significantly affected the biodegradation of diesel oil in the heavy metals and petroleum hydrocarbon polluted soil that is under salinity and drought stress.

کلیدواژه ها:

Diesel oil ، P.indica ، Salinity ، Drought ، Biodegradation