Effects of Cd Contamination on Number of Microbes,Physiological and Biochemical Characteristics of Brassica juncea

Series of pot experiments were performed to determine the effects of cadmium in soil on chlorophyll content,CAT,POD and SOD activities in Brassica juncea.The results indicated that tolerance of Brassica juncea for Cd was stronger.It was able to burgeon and grow all right in the soil added Cd from 0 to 200 mg·kg-1.The biomass of Brassica juncea taken on principle of parabola changes with Cd concentration in the soil.Nevertheless,Cd influenced the growth stages of Brassica juncea to postpone its procreating growth.Cd concentration of Brassica juncea gone to increase with the content of Cd in the soil.The contents of Cd was 7.824~102.672 mg·kg-1 in the aboveground parts and 0.374~191.910 mg·kg-1 in the underground parts.The bioaccumulation factor of the ground part was falling and underground part was rising during the Cd is rising.Meanwhile,the translocation factor was 20.920~0.535.It taken on gradually falling trend.The POD,CAT and SOD activities increased at lower Cd concentrations,but decreased at higher Cd concentrations.Added Cd in the soil was 120 mg·kg-1,the POD,CAT and SOD activities was highest.The number of microorganisms was Bacteriaactinomycetesmould.The number of microbes was increasing during the Cd added in the soil.When the added Cd was more than 160 mg·kg-1,the number of microbes was going down.