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Three to five week old Charles River white rats of the same litters were intraperitoneally injected with a commercial sample of 2, 4-dichlorophenoxyacetic acid (2, 4-D) dissolved in dimethyl-sulfoxide, in concentration ranging from 25 to 350μg/kg. Eight treated animals and one control were used for 4-hr exposure periods to determine the direct effect of 2, 4-D on chromosomes. Nine treated and one control animals were used for the 24-hr exposure periods to determine direct and indirect effects of 2, 4-D. Data were taken from 50 cells with adequate chromosome spreads for each experimental animal in each of the three replicates. Statistical analysis (ANOVA and Dunnett's Multiple Comparisons Test) revealed a significant increase in the rate of chromosome aberrations at 100μg/kg, both for 4-hr and 24-hr tests. Generally, at other treatment levels the rate of chromosome aberrations was higher though statistically not significant. It appears that 2, 4-D induced clastogenicity peaks at 100μg/kg.

Induced clastogenicity in white rats by the herbicide 2,4-D.