BCF and TF of cadmium in H. annuus grown in cadmium-contaminated soil inoculated with Micrococcus sp. ( ) or Klebsiella sp. ( ) and supplemented with EDTA (   ) compared with an uninoculated control ( ) for 2 and 4 wk. The error bars are the S.E. of three replicates and the small letter above the bar graph denotes a significant difference (p < 0.05) in comparison with the control treatment.