Physiological responses of maize to elemental sulphur and cadmium stress
2006
Cui, Y.,Graduate Univ. of Chinese Academy of Sciences, Beijing (China). Coll. of Resources and Environment | Wang, Q.,Graduate Univ. of Chinese Academy of Sciences, Beijing (China). Coll. of Resources and Environment
The physiological response to application of elemental S and Cd of maize plants grown in pots for 60 days was studied. The S was added into the soil at the rates of 0 and 50 mmol/kg, Cd was added in solution at the rates of 0, 20, 50, and 100 mg/kg. All the S and Cd were added before planting. Shoot biomass decreased with the application of Cd to the soil whether S was applied or not. The application of S and Cd led to an increasing accumulation of Cd in maize shoots. The concentration of chlorophyll was reduced significantly in Cd-treated plants with or without supplementary S. In comparison with control plants, the content of malondialdehyde (MDA) increased significantly in all experimental plants. The activity of peroxidases (POD) increased, whereas that of catalase (CAT) decreased in plants treated with Cd, independently of the addition of S. The results suggest that Cd reduces the crop growth, concentration of chlorophyll and activity of CAT, but increases the content of MDA and activity of POD. S supplies decrease the content of MDA, activities of POD and CAT, as compared with zero S supplies at the same rate of Cd application.
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