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| Effect of manganese on cadmium accumulation in Celosia argentea Linn., a hyperaccumulator |
| Received:September 01, 2018 |
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| KeyWord:Celosia argentea Linn.;cadmium;manganese;soil solution |
| Author Name | Affiliation | E-mail | | MENG De-jia | Guilin University of Technology, Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin 541004, China | | | LIU Jie | Guilin University of Technology, Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin 541004, China | liujie@glut.edu.cn | | YU Guo | Guilin University of Technology, Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin 541004, China | | | JIANG Ping-ping | Guilin University of Technology, Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin 541004, China | | | LÜ Dai-lin | Guilin University of Technology, Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin 541004, China | |
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| Abstract: |
| To explore the effects of Mn on the uptake and accumulation of Cd in Celosia argentea Linn., a hydroponic experiment (with Cd treatments of 0, 0.6, 1, and 2 mg·L-1) and a soil culture experiment (with Cd treatments of 0, 3, 5, and 10 mg·kg-1) were conducted with, and without Mn application (100 mg·L-1 for the hydroponic experiment and 500 mg·kg-1 for the soil experiment). In addition, Cd concentrations in soil solutions were also tested during the soil culture experiment. The results showed that the effect of Mn on Cd uptake and accumulation in C. argentea differed between the hydroponic and soil experiments. In the hydroponic experiments, application of Mn significantly reduced the uptake and accumulation of Cd in C. argentea. At a Cd treatment of 0.6 mg·L-1, the application of Mn decreased Cd in the leaves by 35.9%. In soil culture experiments, however, applying Mn significantly enhanced the uptake and accumulation of Cd in C. argentea. When soil Cd was 3 mg·kg-1, the application of Mn increased Cd concentrations in leaves by 352% when compared with the control. The application of Mn significantly increased the Cd concentrations in the soil solution (P<0.05), although the concentrations of Cd in the soil solutions were relatively low. The inhibiting effect of Mn on Cd uptake in hydroponic experiment indicated that Cd and Mn may share some uptake and transport pathways in the C. argentea. By contrast, a promoting effect of Mn on Cd uptake was observed in the soil experiment due to their ion exchange behaviour in the soil. The application of Mn promoted the release of Cd from the soil into the soil solution, thereby increasing the uptake of Cd by plant roots. |
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