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| Pollution characteristics of microcystins in soil and their harm to crops |
| Received:December 20, 2024 |
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| KeyWord:cyanobacterial blooms;soil pollution;vegetable;rhizosphere effect;migrate |
| Author Name | Affiliation | E-mail | | WANG Tongxin | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | | | SONG Weijie | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | | | ZHOU Luan | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | | | CHEN Xuwen | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | chenxuwen@njau.edu.cn | | GAO Yanzheng | Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| Microcystins（MCs）are a class of biotoxins that are released in large quantities during the occurrence of harmful cyanobacterial blooms, and it can enter the soil through irrigation, overflow, algal fertilizer application. MCs are easily absorbed and enriched by crops, and could migrate to human body through the food chain, which seriously threatening the environment and human health. In this paper, the source and pollution characteristics of MCs in soil were analyzed, and it was found that irrigation was the main way for MCs to enter the soil, and the accumulation concentration in soil was as high as 276 μg·kg-1. MCs pollution in soil is pervasive, persistent and difficult to removal. The accumulation, migration and harm of MCs in soil and crops were explored. It was found that MCs in the soil could be absorbed and accumulated in all crop growth cycles, and the accumulation content of MCs in brassica chinensis and brassica napus was relatively high, especially in the edible parts of mature crops, and the accumulation in crops often shows the law of roots>leaves>stems. MCs in crops can reduce the germination rate of crop seeds, inhibit individual growth, change individual morphology, and it also can change physiological and biochemical properties of crops by reducing the activities of superoxide dismutase, peroxidase and other enzymes. Moreover, the effect of MCs on seedlings is more serious than that on mature plants. It is proposed that the rhizosphere effect may be the main reason that affecting MCs migration from soil to crops, which is a worthy research direction in the future, and this work provides new ideas for studying the pollution of MCs and reducing the environment risk. |
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