Investigation of methoxyfenozide insecticide genotoxicity with Allium and SMART methods
Abstract
Aim of study: To assess the genotoxicity of methoxyfenozide by the Allium test and Somatic Mutation and Recombination Test (SMART).
Area of study: The Institute of Science Laboratories at Nevsehir Haci Bektas Veli University.
Material and Methods: In the Allium test, onion root tips were exposed to methoxyfenozide concentrations of 0.005 mL/L, 0.01 mL/L, and 0.02 mL/L for 24 hours. Post exposure, root tips preparations were analyzed for Mitotic Index (MI) and Chromosome Aberrations (CA). In the SMART, 72 ± 4-hour old transheterozygous larvae, derived from the standard cross of multiple wing hairs (mwh) males and flare (flr3) virgin females, were exposed to methoxyfenozide at concentrations of 0.1 mL/L, 0.2 mL/L, and 0.4 mL/L in an instant medium. Preparations were made from the wings of emerging adult Drosophila to evaluate clone induction frequencies and wing spots.
Main results: The Allium test indicated a concentration-dependent decrease in MI values 5.88 ± 0.40, 4.71 ± 0.44, and 3.97 ± 0.47 at 0.005 mL/L, 0.01 mL/L, and 0.02 mL/L, respectively, compared to the negative control (7.28 ± 0.32). Methoxyfenozide induced common abnormalities such as irregularity, bridges, vagrant, stickiness, and disorientation. The SMART method showed higher clone induction frequencies in both mwh/flr3 and mwh/TM3 flies compared to the negative control. Single and twin clones were observed on the wings of transheterozygous flies.
Research highlights: The findings indicate that methoxyfenozide may be genotoxic to both plant and animal systems. However, further research is needed to fully understand the environmental impacts and potential risks to living organisms linked with the agricultural use of methoxyfenozide.
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