外源硫缓解野菊镉毒害分析OA

Taking Chrysanthemum indicum with high,medium,and low cadmium tolerance as experimental materials,hydroponic culture was employed to investigate the physiological growth,cadmium uptake and transport,antioxidant enzyme activity,and antioxidant substance levels of wild Chrysanthemum under cadmium stress treatment supplemented with exogenous sulfur at different concentrations(2.70,1 502.70,6 502.70μmol·L-1)on the physiological growth,cadmium uptake and transport,antioxidant enzyme activity,antioxidant content,and plant chelating peptide levels under cadmium stress,in order to provide a reference for plant-based cadmium pollution remediation.The results showed that,1)exogenous sulfur alleviated the inhibition of cadmium on rhizome elongation and biomass accumulation in Chrysanthemum indicum.2)Excessive exogenous sulfur reduced cadmium uptake by roots and enhanced cadmium transport to the aboveground parts.3)Exogenous sulfur increased the activities of multiple antioxidant enzymes(SOD,CAT,APX,GR)and alleviated oxidative stress.4)Exogenous sulfur promotes increases in various non-enzymatic antioxidants(AsA,GSH,NPT)and plant chelating peptides(PCs),participates in ROS scavenging,enhances cadmium chelation,and reduces free cadmium content in cells.In summary,exogenous sulfur alleviates cadmium toxicity in Chrysanthemum indicum by reducing cadmium uptake in roots,enhancing cadmium transport capacity,activating antioxidant defense mechanisms,and strengthening chelation effects,thereby maintaining stable plant growth.