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Exposure Impacts of Environmentally Relevant Concentrations of a Glufosinate Ammonium Herbicide Formulation on Larval Development and Thyroid Histology of Xenopus laevis

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Abstract

Thyroid hormones play critical roles in body growth and development as well as reproduction. They also influence the activities of a wider variety of tissues and biological functions, such as osmoregulation, metabolism, and especially metamorphosis in organisms, such as frogs. These complex activities of thyroid hormones are prone to disruption by agricultural pesticides, often leading to modulation of growth and the reproductive system in particular. These substances include Glufosinate ammonium, Glyphosates, Imazapyr, Penoxsulam, and Diquat dibromide among other herbicides. In this study, the standardized Xenopus Metamorphosis Assay protocol was used to assess the potential thyroid-modulatory properties of the Glufosinate ammonium Basta formulation, at relevant environmental concentrations (0.05 mg/L, 0.15 mg/L, and 0.25 mg/L) for 21 days. The results showed that this formulation only reduced the hind-limb length among the morphological endpoints. Histological evaluation showed that the mean thyroid gland area and the mean thyroidal follicle epithelium height were significantly increased following 0.15 and 0.25 mg/L exposures. The present study confirmed that this Basta formulation interacts with the thyroid axis and therefore potentially pose health hazard to amphibian in particular and potentially metamorphic aquatic vertebrates. Furthermore, the result is a signal of inherent potential thyroid disrupting activities that must be further investigated and characterised in some of the aquatic herbicide formulations to safeguard the aquatic biodiversity.

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Funding

This study was supported by the Water Research Commission, South Africa, Research grant (Grant number K5/1952), as well as the Working for Water Department, Ministry of Water Affairs, South Africa, for the supply of all the herbicides used for this study. We declare that both the Water Research Commission and Working for Water Department, both in South Africa, did not in any way contribute to the design of the experiment, data analysis, as well as report writing and our choice of publication.

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Correspondence to Oluwaseun O. Babalola.

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The authors declare no conflict of interest in financial, relationship, or otherwise.

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All the use of animals, their housing, breeding and exposure were approved by the Animal Research Ethical Committee of the Stellenbosch University (Approval no-SU-ACUM 12–15).

Appendix

Appendix

See Table 2 .

Table 2 The Gas chromatography analytical results with very low variations compared to the predicted nominal concentrations). The limit of detection was 0.05 μg/L

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Babalola, O.O., Truter, J.C., Archer, E. et al. Exposure Impacts of Environmentally Relevant Concentrations of a Glufosinate Ammonium Herbicide Formulation on Larval Development and Thyroid Histology of Xenopus laevis. Arch Environ Contam Toxicol 80, 717–725 (2021). https://doi.org/10.1007/s00244-020-00758-3

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