Effect of 100 mM Cr (VI) on the level of Cr accumulation (A), MDA (B), Proline (C), Non-protein thiol (D) in rice root after 24 h and 7 days treatment. The rice variety IR-64 was germinated and allowed to grow for 5 d at 37°C and then transferred to Hewitt solution for growth. After 10 d of growth, seedlings of uniform size and growth were treated with Cr (VI) (100 μM) under standard physiological conditions of 16 h light (115 μmol m-2 s-1) and 8 h dark photoperiod at 25 ± 2°C. The values are means of triplicates ± SD. ** and *** = significantly different at P ≤ 0.01 and P ≤ 0.001, respectively, according to Student's unpaired t-test.