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The effects of different concentrations of Zn2+ion on root growth,cell division,and nucleoli of Allium cepa were studied. The test Zn2+ ion concentration was made up from zinc sulphate (ZnSO4. 7H2O) ranging from 10-7 to 10-2 mol/L. The solutions were prepared in tap water (pH =6. 5).The results indicated that Zn2+ could obviously inhibit root growth at concentrations from 10-4)to 10-2 mol/L.Roots treated with zinc sulphate showed the presence of c-mitosis, anaphase bridges,including sticky and fluidized bridges (at 10-3 to 10-2 mol/L) , chromosome stickiness, irregularly shaped nuclei, broken nuclei and micronuclei. A toxicity effect was also observed on the nucleoli using silver staining technique after 48h of treatment with 10-4to 10-2 mol/L Zn2+, e. g,the nucleolar particulate material scattered around the nucleoli in the nucleus of root tip cells.
