Effects of cerium oxide on rice seedlings as affected by co-exposure of cadmium and salt. (September 2019)

• Record Type: Journal Article
• Authors: Wang, Yaoyao; Wang, Lingqing; Ma, Chuanxin; Wang, Kexiang; Hao, Yi; Chen, Qing; Mo, You; Rui, Yukui
• Is Part Of: Environmental pollution. Volume 252(2019):Part B
• Page Start: 1087
• Page End: 1096
• Publication Date: 2019-09
• Subjects: Oryza sativa L. -- Cadmium -- Salt -- Antioxidant enzymes -- 8-OHdG -- Co-contamination; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2019.06.007
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Effects of CeO2 NPs (200 mg.L −1 ) on rice ( Oryza sativa L.) alone or co-exposure with cadmium (Cd) and salt (sodium chloride, NaCl) were investigated in hydroponic systems for two weeks. Physiological results show that rice biomass was significantly inhibited when NaCl or CdCl2 added alone or in co-exposure treatment. CeO2 NPs significantly relieve the chlorophyll damage under CdCl2 environmental stress. The presence of CeO2 NPs alleviated both stressors induced damages to rice as indicated by the reduced proline level. Additionally, CeO2 NPs triggered the antioxidant defense systems to counteract the oxidative stress caused by NaCl and CdCl2 . The level of 8-OHdG, one of the most important indicators for genotoxicity, in rice suggest that the presence of CeO2 NPs reduced the DNA damage in NaCl treated rice. Elemental analysis indicated that co-exposure to NaCl and CdCl2 slightly decreased the Cd content as compared to the one in the CdCl2 alone treatment, and this co-exposure also significantly reduced the Na content when comparing with the NaCl alone treatment. Taken together, our findings suggest that CeO2 NPs could alleviate the CdCl2 and NaCl stresses, but could not completely change the phenotype of both contaminants treated rice. Graphical abstract: Image 1 Highlights: CeO2 NPs reduced the proline level of rice seedlings under NaCl and Cd exposures. CeO2 NPs counteracted NaCl and Cd induced stresses by antioxidant defense systems. The content of 8-OHdG in NaCl treated rice seedlings was decreased by CeO2 NPs. Both Na and Cd contents in rice seedlings were decreased in the co-stress exposure. Abstract : CeO2 NPs alleviated salt stress and cadmium toxicity by lowering the levels of proline and 8-OHdG and triggering the antioxidant defense systems.