Abstract
Chlorpyrifos is one of the most used insecticides in agro-ecosystems and is repeatedly applied due to the increase in pest resistance, which leads to environmental accumulation. The aim of this work was to evaluate the effect of chlorpyrifos on growth and aflatoxin B1 (AFB1) production by four Aspergillus section Flavi strains, under different water conditions—aW (0.93, 0.95 and 0.98)—on maize-based medium (MMEA) and maize grains supplied with 0.06 to 1.4 mmol/L of chlorpyrifos. MMEA plates were incubated at 18, 28, and 37 °C and plates with maize grains at 25 °C during 21 days. Chlorpyrifos stimulated the growth and AFB1 production of non-target organisms, such as Aspergillus section Flavi strains, both at low (0.06 mmol/L) and at high concentrations (1.4 mmol/L) on MMEA and maize grains. Stimulation occurred over a wide range of temperature and aw conditions. The toxin concentration produced by the two strains on MMEA at 18 °C increased when the concentration of chlorpyrifos also increased, being most significant at 0.6 mmol/L. In conclusion, the presence of chlorpyrifos should be considered as a factor, together with environmental conditions, for the development of effective production practices of maize grains, in order to avoid fungal growth and AFB1 production, to prevent both economic losses and risks to human and animal health.
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Funding
This work was supported by the Agencia Nacional de Promoción Científica y Tecnológica (ANPCYT-PICT- 0943/14) and Secretaría de Ciencia y Técnica, Universidad Nacional de Río Cuarto (SECYT-UNRC- 18/453).
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Magnoli, K., Benito, N., Carranza, C. et al. Effects of chlorpyrifos on growth and aflatoxin B1 production by Aspergillus section Flavi strains on maize-based medium and maize grains. Mycotoxin Res 37, 51–61 (2021). https://doi.org/10.1007/s12550-020-00412-w
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DOI: https://doi.org/10.1007/s12550-020-00412-w