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| Alleviation by Selenium of Cadmium Toxicity to Rice and Its Mechanisms |
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| KeyWord:rice; cadmium; selenium; translocation; sub-cellular distribution; non-protein thiols |
| Author Name | Affiliation | | PANG Xiao-chen | College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | WANG Hui | Department of Environmental Engineering, Henan University of Science and Technology, Luoyang 471023, China | | WU Ze-ying | College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | WANG Shuang | College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | LIU Chu-ye | College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | HE Guo-xiu | College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | GE Ying | College of Resource and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China |
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| Abstract: |
| Minimizing cadmium（Cd） accumulation in rice grain is crucial to food safety. In this study, a hydroponic experiment was performed to investigate the effects of exogenous selenite[Se（Ⅳ）], a dominant Se species in rice paddy soils after flooding, on Cd absorption, translocation and detoxification in rice under different Cd concentrations. Selenite markedly reduced Cd accumulation and translocation in rice in high Cd（5.0 μmol·L-1） treatment but had no significant influence in low Cd（0.5 μmol·L-1） treatment. However, Cd at both low and high concentrations increased Se absorption but reduced Se transport to the aboveground part of rice. Combined Cd-Se treatment enhanced root non-protein thiol（NPT） concentrations, changed Cd subcellular distributions in rice root, with increased Cd in cell walls and decreased Cd in cellular organelles and soluble fractions, thus reducing Cd translocation to the aboveground and lipid peroxidation in the cell membrane of rice shoot. Due to the strong tolerance of the rice cultivar to Se and Cd, the activities of antioxidant enzymes and total anti-oxidation capacity in rice shoot did not differ significantly among various treatments, and rice biomass and phenotypic characteristics were unaffected either. |
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