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| Effects of silicon on cadmium accumulation and non-protein thiol content in the seedlings of two rice varieties under cadmium stress |
| Received:July 03, 2017 |
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| KeyWord:rice seedling;cadmium;silicon;non-protein thiol;sub-cellular distribution |
| Author Name | Affiliation | E-mail | | LI Jiang-xia | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHANG Jun | School of Life Sciences, Anhui Agricultural University, Hefei 230036, China | | | MA You-hua | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | yhma2020@qq.com | | CAI Man-di | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | GAO Fei | School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | |
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| Abstract: |
| Many studies have revealed that silicon(Si) enhances plant growth and decreases cadmium(Cd) accumulation in the shoots on rice. In this study, we examined Cd content and its subcellular distribution in two rice varieties(NJ4 and HLY6) using hydroponic experiments with treatments of Si(Na2SiO3) and Cd(50 μmol·L-1, CdCl2) for 7 days. The effects of Si on the contents of Cd and non-protein thiols(NPT) in both shoots and roots were examined. The results showed that under the different Si and Cd treatments, significant differences were found in the biomass of the two rice varieties. Both Si treatments significantly increased rice biomass. The Cd content in roots was higher than that in the aboveground parts. Transfer factors of the rice variety with the low grain Cd content(NJ4) were lower than those in the rice variety with high grain Cd content(HLY6). Si significantly reduced Cd accumulation and translocation in rice in the 50 μmol·L-1 Cd treatment. Under Cd stress, the content of NPT in rice was affected by Si. With Cd treatment alone, the content of NPT in roots of the two varieties was significantly higher than that of the control. Combined Cd-Si treatment resulted in no significant changes in the content of NPT in the roots of rice NJ4, but significantly decreased the content of NPT in stems. Cd-Si treatment also significantly increased the content of NPT in the roots of HLY6 but decreased the content of NPT in the stems of HLY6. In addition, the subcellular distributions of Cd in rice roots indicated that the content of Cd in the cytosol was higher than that in cell walls, and was lowest in cell organelles. Rice shoots had a higher content of Cd in cell walls than in the cell cytosol, with the lowest content being observed in cell organelles. |
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