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| Chemical species and subcellular distribution of cadmium in Kochia scoparia (L.) Schrad. |
| Received:August 31, 2022 |
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| KeyWord:cadmium;Kochia scoparia (L.) Schrad.;accumulation;subcellular distribution;chemical form |
| Author Name | Affiliation | E-mail | | WU Liang | Changsha Uranium Geology Research Institute, CNNC, Changsha 410007, China
Hunan Provincial Engineering Research Centre for the Evaluation and Comprehensive Utilization of Associated Radioactive Mineral Resources, Changsha 410007, China | | | ZHU Shu | Changsha Uranium Geology Research Institute, CNNC, Changsha 410007, China
Hunan Provincial Engineering Research Centre for the Evaluation and Comprehensive Utilization of Associated Radioactive Mineral Resources, Changsha 410007, China | | | ZHANG Hao | Changsha Uranium Geology Research Institute, CNNC, Changsha 410007, China
Hunan Provincial Engineering Research Centre for the Evaluation and Comprehensive Utilization of Associated Radioactive Mineral Resources, Changsha 410007, China | | | TAN Ju | Changsha Ecological Environment Monitoring Center of Hunan Province, Changsha 410001, China | | | WANG Fan | Changsha Environmental Protection College, Changsha 410004, China | | | NIU Hongyu | School of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | TAN Lu | School of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | YANG Haijun | School of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | yhj@hunau.edu.cn |
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| Abstract: |
| To verify the subcellular distribution and characteristics of cadmium(Cd) in the stems and root system of Kochia scoparia(L.) Schrad., the biomass at maturity, accumulation of Cd in roots and stems, and chemical morphology of Cd were studied under varying pH and concentrations of Cd to induce stress. Results showed that the stem biomass at all treatments was higher than that of the root. When the Cd concentration was 1.5-3.0 mg·kg-1, the total biomass of the T treatment(pH 6.1) was higher than that of the TS treatment(pH 5.0). The enrichment coefficient of Cd in all treatments was higher in the stem than that in the root, indicating that the bioconcentration ability of Cd in the stem of K. scoparia was stronger than that in the root system. At a concentration of 1.5-9.0 mg·kg-1, the accumulation of Cd in the stem in the T treatment was higher than that in the TS treatment. More than 85% of the Cd in the root system and stems of K. scoparia was stored in cell walls and vacuoles, indicating that both were important sites for the compartmentalized distribution and detoxification of Cd in K. scoparia plant cells. The proportion of Cd in the root organelles of K. scoparia was lower than that in the stem, which was an important reason for the high Cd concentration in the stem. The largest proportion of Cd was distributed in the acetic acid extraction, sodium chloride extraction, and ethanol extraction(T:82.96%-88.17%; TS:83.70%-89.70%) in the stem and root systems of the K. scoparia, which were relatively less mobile and toxic. The acetic acid extraction had the highest content(T:37.31%-56.24%; TS:40.98%-52.32%), and the sodium chloride extraction and ethanol extraction were close to each other. This Cd fraction was an important defense mechanism to reduce Cd bioavailability and toxicity. When the soil was under pH 6.1 and the Cd stress was 1.5 mg·kg-1, K. scoparia had a good detoxification effect on the Cd in the soil. Studies have reported that K. scoparia has tolerance to different levels of Cd stress and has strong adaptability to acidic soil, which is conducive to the restoration and treatment of acidic farmland soil in the Hunan region. |
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