Abstract
Microcystis growth and physiological responses to chloramphenicol (CAP)-stress were explored at different phosphorus (P) concentrations during 20-day exposure. Under CAP-stress, Microcystis exhibited (i) stronger total protein synthesis and antioxidant defenses at 5 mg/L P than 0.05–0.5 mg/L P in early test period (before day 8), and (ii) greater CAP-removal via biodegradation at 5 mg/L P in mid-late period. Due to above mechanisms, 5 mg/L P largely alleviated the inhibitory effect of CAP on Microcystis growth until test end, thus minimizing CAP toxicity to Microcystis, compared with 0.05–0.5 mg/L P. Moreover, microcystin-production and -release by Microcystis under CAP-stress were also P-dependent. These results suggested that under CAP-stress, although Microcystis growth was more inhibited at 0.05–0.5 mg/L P, higher microcystin-release and CAP residual at 0.05–0.5 mg/L P than at 5 mg/L P still caused eco-risks, which had important implication for risk assessment during Microcystis-dominated blooms and CAP pollution co-occurrence in different waters.
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This work was funded by the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130008120026).
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Luo, L., Li, J., Zhang, Z. et al. Phosphorus Influences the Interaction Between Toxigenic Microcystis and Chloramphenicol. Bull Environ Contam Toxicol 102, 391–398 (2019). https://doi.org/10.1007/s00128-018-2505-3
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DOI: https://doi.org/10.1007/s00128-018-2505-3