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Ecotoxicity of perfluorooctanoic acid and perfluorooctane sulfonate on aquatic plant Vallisneria natans

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Abstract

Perfluorinated compounds (PFCs) are persistent organic contaminants that are highly toxic to the environment and bioaccumulate, but their ecotoxic effects on aquatic plants remain unclear. In this study, the submerged plant Vallisneria natans was treated with short-term (7 days) and long-term (21 days) exposures to perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) at concentrations of 0, 0.01, 0.1, 1.0, 5.0, and 10 mg/L, respectively. The results showed that both high concentrations of PFOA and PFOS inhibited the growth of V. natans and triggered the increase in photosynthetic pigment content in leaves. The oxidative damage occurred mainly in leaves, but both leaves and roots gradually built up tolerance during the stress process without serious membrane damage. Both leaves and roots replied to short-term stress by activating superoxide dismutase (SOD), catalase (CAT) and polyphenol oxidase (PPO), while peroxidase (POD) was involved under high concentration stress with increasing exposure time. Leaves showed a dose–effect relationship in integrated biomarker response (IBR) values under short-term exposure, and the sensitivity of roots and leaves to PFOS was higher than that of PFOA. Our findings help to increase knowledge of the toxic effects of PFCs and have important reference value for risk assessment and environmental remediation of PFCs in the aquatic ecosystem.

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Funding

This research was supported by the National Natural Science Foundation of China (No: 31270410 and 30670206).

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WZ: conceptualization, formal analysis, investigation, methodology. ZL: writing (original draft, review, and editing). ZK: writing (review and editing). ZW: supervision, writing (review and editing). All authors read and approved the final manuscript.

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Correspondence to Zhonghua Wu.

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The authors declare no competing interests.

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Responsible Editor: Gangrong Shi

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Lin, Z., Zhou, W., Ke, Z. et al. Ecotoxicity of perfluorooctanoic acid and perfluorooctane sulfonate on aquatic plant Vallisneria natans. Environ Sci Pollut Res 31, 26646–26664 (2024). https://doi.org/10.1007/s11356-024-32705-3

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  • DOI: https://doi.org/10.1007/s11356-024-32705-3

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