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| Cadmium remediation efficiency and mechanism of enhanced phytoextraction by Sedum plumbizincicola with natural organic acids |
| Received:August 28, 2021 |
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| KeyWord:Sedum plumbizincicola;Cd;soil;citric acid;malic acid;tissue culture plantlet;seedling cutting |
| Author Name | Affiliation | E-mail | | LI Maolin | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | CHEN Zhe | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guilin University of Technology, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China | ldchenzhe@qq.com | | ZHOU Hongyan | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | WU Jialing | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | LI Kanqi | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | YOU Shaohong | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | |
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| Abstract: |
| A pot experiment was conducted to investigate the enhanced phytoextraction of cadmium（Cd）in tissue culture plantlets and seedling cuttings of Sedum plumbizincicola using 5 mmol·kg-1 citric acid, 5 mmol·kg-1 malic acid, or 0 mmol·kg-1 organic acid（control）. We measured soil pH, available Cd, and Cd accumulation in specific plant organs. Net Cd fluxes in the meristematic zone, growth zone, and maturation zone of roots were monitored using non-invasive micro-test technology. Compared to the control, soil application of 5 mmol·kg-1 citric acid or malic acid significantly increased the available Cd in the soil as well as net Cd influxes in three root micro-zones by acidizing the soil. Both citric and malic acid enhanced Sedum growth and Cd content in the plant organs. The Cd content in the shoots of Sedum plantlets increased by 90.4% and 61.6%, respectively. The Cd content in the shoots of seedling cuttings increased by 73.8% and 34.5%, respectively. The application of 5 mmol · kg-1 citric acid can effectively enhance phytoremediation of Cd-contaminated soil with S.plumbizincicola. Compared with tissue culture plantlets, seedling cuttings have better growth adaptability and remediation efficiency in Cdcontaminated soil. |
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