Abstract
We examined the effects of copper and lead on the antioxidant enzyme response of Alternanthera philoxeroides and Nasturtium officinale using a benchtop luminometer. Alternanthera philoxeroides is a nonnative invasive plant species that has spread throughout the wetland ecosystem in the southern part of the USA. Its invasion is facilitated by its ability to thrive in a wide range of abiotic conditions. Nasturtium officinale is an aquatic plant that is sensitive to relatively low amounts of pollution and is most commonly found in springs and shallow bodies of water. While A. philoxeroides tolerates organic pollution and heavy metals, N. officinale exhibits stress at low levels of pollution. Alternanthera philoxeroides antioxidant enzyme production was unaffected by increasing concentrations of both copper and lead. The antioxidant enzyme response of N. officinale showed a significant increase when plants were exposed to 10 and 25 ppm lead. Endogenous peroxidase concentrations of the control plants were also compared showing that A. philoxeroides possessed a significantly higher concentration of peroxidases than N. officinale. We hypothesize that a higher endogenous peroxidase concentration may be a mechanism that hyperaccumulator plants use to tolerate inhospitable concentrations of copper and lead.
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University System of Georgia STEM IV grant (BOR STEM IV Initiative) provided partial financial support for student researcher stipends. The funding body had no role in study design, collection, analyses of data, and writing the manuscript.
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All authors contributed to the study, conception, and design. Material preparation, data collection, and analysis were performed by Christopher Beals, Hannah King, and Ginger Bailey. The first draft of the manuscript was written by Christopher Beals, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. Acquisition of data: C. Beals, H. King, G. Bailey.
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Beals, C., King, H. & Bailey, G. The peroxidase response of Alternanthera philoxeroides (Alligator Weed) and Nasturtium officinale (Watercress) to heavy metal exposure. Environ Sci Pollut Res 30, 59443–59448 (2023). https://doi.org/10.1007/s11356-023-26697-9
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DOI: https://doi.org/10.1007/s11356-023-26697-9