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| Effects of silicon and zinc interaction on the uptake of cadmium in rice seedlings |
| Received:July 09, 2018 Revised:September 25, 2018 |
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| KeyWord:rice;cadmium;silicon;zinc;soluble proteins |
| Author Name | Affiliation | E-mail | | JIAO Xin-tian | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | XUE Wei-jie | Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAO Yan-ling | Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Chang-bo | Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | YAN Lei | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | LIU Zhong-qi | College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | liuzhongqi508@163.com |
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| Abstract: |
| The mechanism of Si-Zn interaction in the root rhizosphere of rice seedlings that inhibits the uptake of Cd was studied. Experimental results show that the addition of 0.05 mmol·L-1 and 0.1 mmol·L-1 sulfhydryl silicon into the nutrient solution with 2.7 μmol·L-1 Cd reduced the Cd content in rice roots by 5.4% and 34.7%, and in shoots by 3.5% and 51.8%, respectively. The coexistence of Si and Zn displayed more significant inhibition on Cd uptake. The addition of 0.2 mmol·L-1 Zn and 0.05 mmol·L-1 or 0.1 mmol·L-1 Si reduced the Cd content in the rice roots by 27.4% or 68.9%, in shoots by 78.0% or 88.0%, respectively. The interaction of Si-Zn significantly reduced the Cd distribution proportion in the cell walls of roots and in the cytoplasm fraction of shoots. Simultaneously, the coexistence of Si and Zn promoted the absorption of essential elements, such as K, Ca, Fe, and Zn, by the roots and their subsequent transfer to the shoots. In the Cdstress environment, the addition of Si and Zn significantly increased the content of soluble proteins in roots, but had little effect on shoots. These results indicate that increasing the concentrations of Si and Zn in the root rhizosphere can promote the fixation of Cd in roots and the synthesis of soluble proteins in root cells by promoting the absorption and transfer of essential elements, finally inhibiting the transfer of Cd from root cytoplasm to shoots. |
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