Abstract
Treatment of Alium cepa seeds with different concentrations of Methyl parathion (insecticide) and Tri-miltox (fugicide) induced different types of chromosomal aberrations, such as micronuclei, chromosomal fragments, laggard chromosomes, single and multiple bridge formation. Maximum number of cells were observed with micronuclei, then with bridges and the minimum with laggard chromosomes. Methyl parathion produced comparatively more chromosomosomal aberrations than Tri-miltox. Comparing the three treatments applied, seed treatment produced maximum chromosomal aberrations, and the root treatment with recovery period produced the minimum chromosomal aberrations with the root treatment occupying the intermediate position.
