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ABSTRACT
Plants of Mentha aquatica L. treated with chromium (VI) developed dark brown roots with black tips. The outermost layer of the root cap on treated roots had no statolytes and were collapsed. The cells in the central cylinder of treated roots were disorganized and the tangential cell walls were heavily thickened. Lateral roots developed in the root hair zone of cuttings treated with 20 and 40 mg/liter of chromium for four and seven days. Leaves of chromium treated cuttings had a loss of tissue organization, a change in palisade layer cell shape, and an increase in intercellular spaces with fewer cell layers in the mesophyll proportional to the concentration of chromium. The chloroplasts and starch granules were less developed in chromium treated plants as compared with non-treated control plants.