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The incubation of Allium cepa L. roots in Pb(NO 3 ) 2 , Cd(NO3)2×4H2O or Cr(NO3)3×9H2O solution at the concentration of 100μM lowered the mitotic index (MI) value in meristem by 58%, 39%, 48%, respectively. The proportion of mitotic phases (mainly prophases and telophases) in MI value was also changed. Moreover, mitotic disturbances such as: c-metaphases, sticky and lagging chromosomes,...