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| Toxic effects of cadmium on Caenorhabditis elegans in soils |
| Received:October 16, 2022 |
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| KeyWord:cadmium;CaCl2-extracted Cd;toxicity;Caenorhabditis elegans;soil |
| Author Name | Affiliation | E-mail | | WANG Xin | College of Land and Environment, Shenyang Agricultural University, National Engineering Research for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | DANG Xiuli | College of Land and Environment, Shenyang Agricultural University, National Engineering Research for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | dxl@syau.edu.cn | | ZHAO Long | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | HOU Hong | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | GENG Jian | College of Land and Environment, Shenyang Agricultural University, National Engineering Research for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | | | AO Xiang | College of Land and Environment, Shenyang Agricultural University, National Engineering Research for Efficient Utilization of Soil and Fertilizer Resources, Key Laboratory of Arable Land Conservation in Northeast China, Ministry of Agriculture and Rural Affairs, Shenyang 110866, China | |
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| Abstract: |
| To determine the toxic effects of cadmium（Cd）on soil nematodes and the differences of Cd toxicity in different soils, the toxic effects of Cd on the model organism Caenorhabditis elegans were assessed in three soils（red soil in Yingtan, Jiangxi; paddy soil in Suzhou, Jiangsu; and black soil in Changchun, Jilin）using growth, fertility, and the number of offspring as evaluation endpoints. The median effect concentration（EC50）values, expressed as the measured concentration of total Cd, for the growth of C. elegans, were 54.37, 197.54 mg·kg-1, and 287.02 mg·kg-1, respectively. The EC50 values for C. elegans fertility were 7.07, 77.41 mg·kg-1, and 103.09 mg·kg-1, respectively, and those for average number of offspring were 5.75, 13.84 mg·kg-1 and 85.94 mg·kg-1, respectively. The results showed that the number of offspring was a more sensitive evaluation endpoint than growth or fertility. Correlation analysis showed that soil pH, cation exchange capacity, organic matter, calcium carbonate content, and manganese oxide were the main factors affecting Cd toxicity in soil. Based on the CaCl2-extracted Cd concentration, the differences in the Cd toxicity thresholds of the three soils were determined and indicated that the available Cd concentration may better explain the differences in Cd toxicity in different soils. |
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