Fig. 4

Effects of aeration or/and 50 μM CdCl₂ treatments on Fe and Cd content in the iron plaque of rice root. a Perls blue staining of iron plaque on the surface of rice roots, upper bar indicates 5 cm and lower bar indicate 1 cm; b Fe content in the iron plaque of rice roots; c Cd content in the iron plaque of rice roots. The 3-week-old rice seedlings under hydroponic culture were aerated with air pump (30 min per hour) in the absence or presence of 50 μM CdCl₂ for 14 d. The values are means ± SE (n = 3). Different letters on bar indicate significant differences at P < 0.05