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| Effects of combined pollution of Pb and Cd on the growth of chili peppers（Capsicum annuum L.）and their absorption of heavy metals |
| Received:September 26, 2024 |
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| KeyWord:combined pollution;interaction;translocation factor;chili pepper;heavy metal |
| Author Name | Affiliation | E-mail | | TAN Shimin | Key Laboratory of Soil Health and Green Remediation, Ministry of Ecology and Environtment, College of Resources and Environment, Huazhong Agricultura University, Wuhan 430070, China | | | KOU Meng | Key Laboratory of Soil Health and Green Remediation, Ministry of Ecology and Environtment, College of Resources and Environment, Huazhong Agricultura University, Wuhan 430070, China | | | LI Ming | Key Laboratory of Soil Health and Green Remediation, Ministry of Ecology and Environtment, College of Resources and Environment, Huazhong Agricultura University, Wuhan 430070, China | | | XIONG Juan | Key Laboratory of Soil Health and Green Remediation, Ministry of Ecology and Environtment, College of Resources and Environment, Huazhong Agricultura University, Wuhan 430070, China | | | WANG Mingxia | Key Laboratory of Soil Health and Green Remediation, Ministry of Ecology and Environtment, College of Resources and Environment, Huazhong Agricultura University, Wuhan 430070, China | wangmx@mail.hzau.edu.cn | | TAN Wenfeng | Key Laboratory of Soil Health and Green Remediation, Ministry of Ecology and Environtment, College of Resources and Environment, Huazhong Agricultura University, Wuhan 430070, China | |
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| Abstract: |
| To explore the effects of combined pollution of Pb and Cd on chili pepper growth and their absorption, pot experiment was conducted with 16 treatments involving Pb and Cd interactions. By analyzing the contents of Pb and Cd in various parts of chili pepper plants, the effects of combined Pb and Cd in the soil-chili pepper system on the accumulation and transport of heavy metals in chili peppers were discussed. The results showed that the nitric acid extraction rate of heavy metals in soil was higher than that of the calcium chloride extraction rate. The combination of low level Pb and Cd promoted the extraction rate by nitric acid. Cd reduced the calcium chloride-Pb extraction rate in soil, while Pb increased the calcium chloride-Cd extraction rate. Under specific Pb concentrations, the fresh weights of roots, stems and leaves of chili pepper increased with the increase of Cd concentration. However, as the combined concentrations increased, the fresh weight of chili pepper fruits decreased. Pb inhibited root elongation at low Cd concentration but promoted root elongation at high Cd concentration. The highest Cd concentration was found in chili pepper fruits, followed by roots, stems and leaves. The content of Cd in roots increased with the increase of Pb concentration. Under the treatment of 3 mg·kg-1 Cd, the content of Cd in fruits exceeded the limit of food quality and safety standards（0.05 mg·kg-1）. The Pb concentration in chili peppers followed the order：root>stem> leaf>fruit, with the Pb content in fruits not exceeding the standard limit（0.1 mg·kg-1）at any studied concentration. The translocation factor （TF）of Cd in chili peppers, specially TFCd stem-fruit was the highest, exceeding 5 in all cases. Both TFCd stem-leaf and TFCd stem-fruit increased with increasing Pb concentration. In contrast, the translocation factor for Pb were ranked as：TFPb root-stem>TFPb stem-leaf >TFPb stem-fruit. Pb promoted the redistribution and translocation of Cd in the aboveground part of chili peppers, but Cd had no effect on Pb translocation. Consequently, growing chili peppers in soil with high concentrations of combined Cd poses a significant risk to human health, while the risk is lower in soil with high concentrations of combined Pb. |
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