Abstract
The responses of Ceratophyllum demersum to gradient concentrations (0, 0.8, 3.2, and 10 µg/L) of microcystin-LR (MC-LR) were comprehensively investigated by laboratory simulation experiments. The high reduction and accumulation efficiency of MC-LR by C. demersum were verified in this study. Results showed that the reduction ratio of MC-LR in the cultivation medium was up to 99% after 14 days of exposure, and the accumulation of MC-LR in C. demersum was highest at an exposure concentration of 10 μg/L, the value of which was 0.9 ng/g fresh weight (FW). Meanwhile, a series of negative effects on C. demersum was detectable, accompanied by a significant biomass reduction of the plant and changes in microbial community composition. In particular, this study indicated that the amount of Flavobacteria was elevated under the stress of MC-LR, provoking great threats to aquatic ecosystems. Moreover, oxidative damage was evidenced by the changes in total antioxidant capacity, superoxide dismutase, and glutathione. The results also demonstrated significant increases in sugar (0.025 mg/g FW), protein (0.3 mg/g FW), and carotenoids (0.6 mg/g FW) in C. demersum stressed by 10 μg/L of MC-LR, compared with the control without microcystins, which were among the defense strategies for dealing with adverse conditions. These results verified the good potential of submerged macrophytes as an eco-friendly strategy for controlling cyanobacterial blooms. However, the negative effects of MC-LR on the macrophytes themselves were also demonstrated, which would be considered in future practice and management.
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This work was financially supported by the Young Backbone Teachers Project of Henan Province (No. 2020GGJS064), the National Nature Science Foundation Project of China (No. 31500380), the Scientific Fund of Henan Normal University (No. 2020QK02), and the Major public welfare projects in Henan Province (No. 201300311300).
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Jing Dong: experiments design, data analysis and draft writing; Dujuan Dai: conducting of the experiments; Yue Yang: data analysis and graphing; Feihu Wang, Jie Yuan, and Yuhuan Chen: assistance in the conduction of the experiments; Yunni Gao and Man Zhang: language improvement and reviewing of the original draft; Xiaofei Gao, Mei Li, and Jingxiao Zhang: assistance in microbial community analysis; Xuejun Li: revision and supervision.
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Dong, J., Dai, D., Yang, Y. et al. Responses of submerged macrophyte Ceratophyllum demersum to the gradient concentrations of microcystin-LR (MC-LR). Environ Sci Pollut Res 29, 71257–71269 (2022). https://doi.org/10.1007/s11356-022-20917-4
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DOI: https://doi.org/10.1007/s11356-022-20917-4