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| Effects of manganese concentrations and transporters on uptake and translocation of cadmium in rice seedlings |
| Received:January 26, 2016 |
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| KeyWord:cadmium;manganese;rice;ionic channel;carrier protein |
| Author Name | Affiliation | E-mail | | XU You | Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | YANG Yi-xin | Xiangyin Bureau of Agriculture, Xiangyin 414600, China | | | LI Wen-hua | Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | CHEN Rui | Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHAO Yan-ling | Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | TANG Qi | Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
School of Resources and Environmental Sciences, Northeast Agricultural University, Harbin 150030, China | | | LIU Zhong-Qi | Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | liuzhongqi508@163.com |
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| Abstract: |
| Heavy metal uptake by plants is influenced by coexisting ions. In this study, the effects of manganese(Mn) and its transporters on uptake and translocation of cadmium(Cd) in rice seedlings, the accumulation characteristics of Cd and Mn as well as their relationships with nonselective cation channels(NSCCs) and P-ATPase were studied under hydroponic conditions. Experimental results showed that at 0.8 mmol·L-1 to 1.6 mmol·L-1 of solution Mn, Cd accumulations were reduced both in roots and shoots, but the percentages of Cd distribution in the cell wall was increased, while that in solube fraction was decreased. In the solution with 4.5 μmol Cd·L-1 and 1.6 mmol Mn·L-1, the percentages of NSCCs contributions to the accumulation of Cd in roots and shoots were 34.9% and 17.0%, and those of P-ATPase were 24.7% and 7.6%, respectively. However, the percentages of NSCCs contributions to the accumulation of Mn in roots and shoots were 24.0% and 10.3%,those of P-ATPase to the accumulation of Mn in roots and shoots were 69.5% and 20.3%, respectively. These results indicate that Cd is mainly transported into root cells through nonselective cation channels, while Mn is primarily carried into root cells via positive transporters. Manganese may inhibit Cd uptake and translocation in rice seedlings by competing ionic channels and carrier proteins. |
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