Figure 3

Light-microscopy images of MB-stained longitudinal sections. Longitudinal sections of six-day-old maize root tips grown under control conditions (A, C) or in the presence of 200 mM NaCl (B, D) in nutrient solution for 48 h (A, B) and 96 h (C, D). E-P Magnification images of MB-stained longitudinal sections through the root tips of a non-stressed plant (E, I, M, G, K, O) or a plant stressed with 200 mM NaCl (F, J, N, H, L, P) for 48 h (E, I, M, F, J, N) and 96 h (G, K, O, H, L, P). E-H Longitudinal sections of the meristematic zone from the root tips. I-P Longitudinal sections of the elongation zone from the root tips. The black rectangular frames in I-L indicate stele tissue observed. Arrows in J and L indicate transverse and radial enlargement cells observed in stele tissues. Arrowhead in L indicates radical enlargement cell observed in cortex. Arrows in N and P indicate irregular cell-division planes in stele tissue observed. Photographs were taken under bright-field illumination. MZ - meristematic zone; EZ - elongation zone; CT - cortex; ST - stele tissue. Bar = 0.25 mm (A-B) or 0.1 mm (E-P).