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OBJECTIVE: To analyze the genotoxic potential of an herbicide with flumioxazin using the Allium cepa bioassay. MATERIALS AND METHODS: The herbicide was tested in two concentrations: 0.5 g/L (as indicated for use) and 1.0 g/L (twice the recommended concentration). Distilled water was used as a negative control and 1% sodium benzoate as a positive cytotoxicity control. RESULTS: Toxicity effects were evidenced in both herbicide concentrations. Cytotoxicity effects were observed in the herbicide with flumioxazin at a concentration of 0.5 g/L, which showed a microscopic pattern equal to that of the positive control. The effects of genotoxicity were observed at both concentrations (0.5 g/L and 1.0 g/L) which resulted in chromosomal aberrations in cells, showing that the herbicide directly interferes with the cell cycle of vegetal onion cells. CONCLUSION: The herbicide with flumioxazin showed toxicity and genotoxicity in the analyzed concentrations and effects of cytotoxicity only in the concentration recommended for use.

Bioensaio com Allium cepa revela genotoxicidade de herbicida com flumioxazina