Evaluation of Growth, Photosynthetic Pigments and Genotoxicity in the Wetland Macrophyte Bidens laevis Exposed to Tebuconazole


The fungicide tebuconazole (TBZ) has been used to prevent terrestrial fungi in agroecosystems, but it can also induce negative effects to non-targeted aquatic organisms, such as plants. The aim of the present work was to evaluate the potential cyto- and genotoxicity of TBZ in the aquatic macrophyte Bidens laevis, exposed to a range of concentrations of 0.1–100 µg/L. Mitosis in root tips were analyzed showing decreased mitotic index and an increase of chromosomal aberrations at 10 and 100 µg/L. The regression of TBZ concentration vs. aneugenic aberrations was significant, indicating the mechanism of genotoxicity. The specific growth rate (Gr) for total length decreased in plants exposed to 0.1, 10 and 100 µg/L. Gr for root decreased in plants exposed at 0.1 and 10 µg/L, reaching a maximum percent inhibition root growth rate (Ir) of 68.8%. These results show that TBZ resulted cyto- and genotoxic to B. laevis at environmentally relevant levels.

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Thank you to G. Lukaszewicz for his help on identifying chromosomal aberrations in the samples and to G. Iturburu for his help in the statistical treatment of the data. This work was supported by FONCYT- AGENCIA (PICT-2013- 1348) and UNMDP (EXA 795/16 and EXA 900/18).

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Correspondence to Mirta L. Menone.

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Moreyra, L.D., Garanzini, D.S., Medici, S. et al. Evaluation of Growth, Photosynthetic Pigments and Genotoxicity in the Wetland Macrophyte Bidens laevis Exposed to Tebuconazole. Bull Environ Contam Toxicol 102, 353–357 (2019). https://doi.org/10.1007/s00128-019-02539-8

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  • Fungicides
  • Plant growth
  • Cytotoxicity
  • Chromosomal aberrations