Combined Effect of Cadmium and Polystyrene Microplastics(PS-MPs)on the Growth,Physiological Character-istics,and Canopy Temperature of the Chinese Cabbage Pakchoi(Brassica chinensis)
Combined Effect of Cadmium and Polystyrene Microplastics(PS-MPs)on the Growth,Physiological Character-istics,and Canopy Temperature of the Chinese Cabbage Pakchoi(Brassica chinensis)
To better understand the effects and internal mechanism of the combined contamination of cadmium(Cd)and polystyrene microplastics(PS-MPs)on the growth,physiological characteristics,and canopy temperature of the Chinese cabbage pakchoi(Brassica chinensis),hydroponic experiments were conducted with Cd and two particle sizes of PS-MPs(100 and 1 000 nm).Changes in the growth,photosynthetic pigments,antioxidant enzyme activities,nutritional quality,anatomical structure,canopy temperature,and Cd absorption and transport characteristics were measured and analyzed.Results show that stress from either Cd or PS-MPs greatly inhibited the cabbage's growth and development and the process of photosynthetic physiological.This stress greatly reduced phenotypic indicators and photosynthetic pigments.Moreover,Cd and PS-MPs stress enhanced the oxidative stress response and decreased the vitamin,soluble sugar and protein con-tents in cabbage leaves.These changes also decreased the thickness of leafy,spongy and palisade parenchym tissues and significantly increased the temperature in the plant canopy.A low PS-MPs concentration(1 mg·L-1)effectively allevia-ted the toxicity of Cd to the cabbage caused by combined stress of Cd and PS-MPs.A high PS-MPs concentration(20 mg·L-1)combined with Cd resulted in a compound stress effect,which adversely affected the growth and development of the cabbage.These results can provide basis for ecological risk assessment of Cd and microplastics pollution in agricultural soil.
维普
万方数据