CYTOLOGICAL EFFECTS OF INSECTICIDES (DIMECRON-100 AND ROGAR-40) ON VICIA-FABA L.

The cytological effect of two organophosphorous systemic insecticides viz., Dimecron-100 and Rogar-40 with different concentrations were studied on the broad bean plant Vicia faba L. from the point of causing any irregularities in the visible chromosomal structure and behaviour. Chromosome and chromatid breaks, dot deletions, fragments and anaphase bridges were noticed in both meta- and anaphase stages of mitosis examined. A maximum of 7.08% of aberrant cells were noticed in 0.1% concentration of Rogar-40 as against 5.97% in the same concentration of Dimecron-100. Dimecron-100 was found to cause less aberrations than Rogar-40. In meiosis aberrations like fragments, ring chromosomes, anaphase bridges, laggards and tetraploidy were noticed. A maximum of 9.70% of aberrant cells were occurred in the 0.1% concentration of Rogar-40 as against 4.7% in the same concentration of Dimecron-100. Even in the 0.05% concentration, a mean of 3.39% and 7.18% of cells with aberrations were noticed in the material treated with Dimecron-100 and Rogar-40 respectively. © 1969, Japan Mendel Society, International Society of Cytology. All rights reserved.