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| Uptake of Selected Tetracycline Antibiotics by Pakchoi and Radish from Manure-Amended Soils |
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| KeyWord:uptake；crop；oxytetracyline; tetracycline |
| Author Name | Affiliation | | HE De-chun | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China | | WU Gen-yi | College of Resource and Environment, Hunan Agriculture University ,Changsha 410128, China | | XU Zhen-cheng | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China | | FANG Jian-de | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China | | ZHANG Su-kun | South China Institute of Environmental Sciences, MEP, Guangzhou 510655, China |
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| Abstract: |
| Veterinary antibiotics may enter soil-plant system via soil applications of animal manure, posing risks to human health. A microplot experiment was conducted in greenhouse to investigate the uptake of selected four tetracycline antibiotics, including tetracycline（TC）, oxytetracyline（OTC）, chlortetracycline（CTC） , and doxytetracyline（DC） by pakchoi and radish grown in a manure-amended soil. Treatments were 0, 5, 20, 50 mg antibiotics kg-1 of manure. The manure was applied at a rate of 20 000 kg·hm-2. Both crops took up four antibiotics during 35 d（pakchoi） and 50 d（radish） periods. Concentrations of the antibiotics in plant increased with increasing antibiotics in soils, and they showed a significant positive correlation. When the concentrations of antibiotics in manure were increased from 20 mg·kg-1 to 50 mg·kg-1, the concentrations of four antibiotics in plants were increased by 67%（TC）, 105%（OTC）, 71%（CTC）, and 83%（DC） for pakchoi and 58%（TC）, 41%（OTC）, 88%（CTC）, and 24%（DC） for radish. The maximum concentration was（51.56±8.85）（TC）, （31.89±4.29）（OTC）, （37.58±5.84）（CTC）, and （17.73±2.39）（DC）μg·kg-1 in pakchoi and （13.93±1.96）（TC）, （14.39± 1.16）（OTC）, （17.30± 3.05）（CTC）, and （8.86± 1.28）（DC）μg·kg-1 fresh weight in radish. Soil properties greatly affected the uptake of four tetracycline antibiotics by crops. Compared to sandy loam soil, concentrations of antibiotics in radish and pakchoi cultivated in red soil decreased by 11%~44% and 21%~47%, respectively. These results indicate that consuming produces from soils amended with manures containing low-levels of antibiotics might pose potential risks to human health. |
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