Fig. 3.

Cell length and cell diameter (upper half of the picture), as well as light microscopical images (100-fold magnification) of longitudinal sections of fixed, Eosin-stained roots of intact maize seedlings incubated for 20 h in 10⁻⁶ M IAA (left bottom picture) and H₂O (right bottom picture), taken from the area of 3 mm behind the quiescent centre. Mean values (± S.E.; n = 18–24). Vertical bars represent 100 µm