Effect of Hg on the Mitosis of Root Tip of Onion

Different concentrating Hg2+ were used separately to treat the root tip of onion 6?18?24 h,pass rule chromosome press part technology,survey the mitosis of root tip cells of onion. The result shows that,with a bigger consistency and time,more effect on the mitosis of root tip of onion.Meanwhileduring the study ,there are several unusualappearance:for example,lasted chromosome,chromosome bridge multiple polarization and chromosome part,and so on.