Abstract
The cytological effects of deltamethrin, a synthetic pyrethroid used as an insecticide, have been studied using root meristems of Allium cepa. Deltamethrin treatment resulted in a dose-related reduction in mitotic index. Both chromosomal and mitotic abnormalities were encountered at all concentrations ranging from 0.05 to 2 ppm. Most of the chromosomal and mitotic abnormalities were apparently due to disturbance in the mitotic spindle. Induction of chromosome and chromatid breaks with higher concentrations (0.5 to 2.0 ppm) suggested clastogenic action of this compound.
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