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| Effects of Nonselective Cation Channels on Accumulation and Transfer of Cd in Rice Seedlings |
| Received:March 24, 2015 |
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| KeyWord:rice;nonselective cation channels;cadmium accumulation;contribution rate |
| Author Name | Affiliation | E-mail | | ZHANG Shen-jun | Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Science, Tianjin Normal University, Tianjin 300387, China
Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | YIN Jie | Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Science, Tianjin Normal University, Tianjin 300387, China
Centre for Research in Ecotoxicology and Environmental Remediation, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHANG Chang-bo | Centre for Research in Ecotoxicology and Environmental Remediation, 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
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: |
| Research has shown that nonselective cation channels(NSCCs) play important roles in the accumulation and transfer of heavy metals in plants. Here seedlings from high and low cadmium(Cd)-accumulating rice varieties were used to study the effects of NSCCs on Cd absorption and accumulation. Experimental results indicated that two types of mechanisms, i.e. low-affinity transport system and high-affinity transport system, were responsible for the Cd uptake in rice root and shoot. The efficiency of Cd absorption and transport in seedlings from the high Cd-accumulating variety was apparently higher than that from low Cd-accumulating one. NSCCs played an important role in Cd absorption and transport in rice seedlings. The contribution rate of NSCCs to Cd accumulation in the rice shoots was greater than that in the roots. This rate was 93.5% for low Cd-accumulating variety at the Cd concentration of 0.1 mg·L-1, which was significantly greater than that of high Cd-accumulating variety. However, NSCCs contributed less to Cd accumulation under higher Cd concentrations. Therefore, NSCCs might be a part of the high-affinity transport system in rice, transporting Cd to the shoots effectively under low Cd concentrations. |
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