Physiological and Biochemical Responses of Kochia scoparia(L.)Schrad.to Soil Cadmium Stress
This study aims to investigate the tolerance and sensitivity of Kochia scoparia(L.)Schrad.to cadmium(Cd)contamination in acid soil.Pot experiments were designed with different Cd concentrations(1.253,1.553,2.153,2.753,4.253,and 10.253 mg/kg)under initial pH 6.1(T group)and pH 5.0(TS group)to evaluate the effects of different pH values and Cd concentrations on the physiological and biochemical parameters of K.scoparia.The experiments yielded the following results.(1)Cd stress had insignificant effects on the root length,root surface area,root volume,average root diameter,and root tip number of K.scoparia.The plants exposed to 1.253～2.753 mg/kg Cd showcased mild changes in the root biomass,stem biomass,and whole plant biomass,demonstrating strong tolerance to Cd stress and adaptation to acid soil.The root growth in the T group was better than that in the TS group.(2)Soil Cd stress had slight inhibitory effect on the photosynthesis of K.scoparia,while the decrease in soil pH increased the photosynthetic pigments in the leaves.(3)The root of K.scoparia had higher activities of superoxide dismutase(SOD)and peroxidase(POD)and higher content of malonaldehyde(MDA)than the stem.Under the same Cd concentration,the increase in soil pH enhanced SOD activity and reduced MDA content in the root and stem.The antioxidases of K.scoparia played a significant role in protecting the plant from soil Cd stress.
cadmium stressKochia scoparia(L.)Schrad.physiological responseantioxidant systemaccumulation and distribution
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