Figure 4.

Effect of phosphorus supply on epidermal cell length along the basal part of the leaf growth zone. L. perenne plants were grown for 47 d at high (1 mm, •) and 61 d at low (0.02 mm, ○) phosphorus supply. The length of the shortest and the longest cell over 50-μm intervals is indicated by continuous lines (1 mm phosphorus) and dashed lines (0.02 mm phosphorus). Data are means of six plants (±se). Arrows indicate the distal end of the division zone. Inset shows the raw cell length data for an individual cell file of a low-phosphorus plant.