Figure 1.

Effects of UV-B radiation on leaf elongation and epidermal cell length. A, Representative image of leaf 4 at 12 d after emergence from plants that were grown in the presence (UV-B) or absence (Control) of solar UV-B. B, Representative image of different cells from the base to the tip of leaf 4. C, Cell length profiles of files adjacent to stomatal rows in the abaxial epidermis measured for control and UV-B-exposed plants. The data were obtained using leaf 4 from 12 plants for which the length of all cells in the basal 100 mm of two cell files adjacent to stomatal files was measured in relation of position. To enable averaging across leaves, the data were smoothed and interpolated into 50-mm spaced data points as described in “Materials and Methods.” For each condition, the average (n = 5) and corresponding se are shown at each position.