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| Effects of zinc supply on absorption and translocation of cadmium in rice seedlings |
| Received:November 14, 2015 |
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| KeyWord:japonica rice;zinc;cadmium;accumulation;translocation;subcellular distribution |
| Author Name | Affiliation | E-mail | | YIN Jie | Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Science, Tianjin Normal University, Tianjin 300387, China
Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHAO Yan-ling | Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | XU You | Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | GAO Zi-ping | Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | CUI Guan-nan | Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | WANG Jing-an | Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Science, Tianjin Normal University, Tianjin 300387, China | jinganwang899@126.com | | LIU Zhong-qi | Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Science, Tianjin Normal University, Tianjin 300387, China
Research Centre for Remediation of Agro-Environmental Pollution, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | liuzhongqi508@163.com |
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| Abstract: |
| Plant nutrition may influence the uptake of heavy metals by plants. Deficiency or toxicity of metal cations in soils reduces plant growth, crop yield, and the quality of plant foodstuff. Zinc(Zn) is an essential micronutrient for plants. Controlling Zn content in plant tissues is critical to plant normal growth and development. Many transporters and channels in the plasma membranes of plant cells are thought to balance the concentrations of essential metals such as Zn, and to unselectively transport toxic elements, e.g. cadmium(Cd). However, the molecular bases of the interactions between Zn and Cd remains poorly understood. In this study, the effects of different Zn2+ concentrations on the seedlings growth, the uptake and translocation of Cd2+ and Zn2+ by japonica rice seedlings under Cd2+ stresses were studied in solution culture. Rice plants were grown for 5 days in nutrient solution containing two levels of Cd(0 μmol·L-1 and 2.7 μmol·L-1) and three levels of Zn(0 mmol·L-1, 1.2 mmol·L-1, and 1.4 mmol·L-1). Results showed that supplying 1.2 mmol·L-1 and 1.4 mmol·L-1 Zn2+ significantly increased the number of root tips as well as roots and shoots biomass of rice seedlings, which decreased root Cd2+ by 86.4% and 97.5%, and shoot Cd2+ by 62.6% and 73.3%, respectively. Most Cd2+ was distributed in the cell wall(F1) and cell sap(F3) of roots and shoots. Cadmium in the organelle(F2) parts was only about 5.4% in roots and 9.4% in shoots. Adding Zn2+ significantly reduced Cd concentrations in F1 and F3 of roots, but increased Cd2+ distribution percentages in F3 of roots. Under exogenous Zn2+, Cd concentrations in root cell sap were lower than 12.8 mg·kg-1 FW, whereas Cd2+ translocation ratio from root cell sap to shoot was significantly enhanced. |
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