||"Stomatal density also increases with irradiance in a range of plants including tomato (Gay & Hurd, 1975), Sinapsis alba (Wild & Wolf, 1980) and Quercus myrsinaefolia (Furukawa, 1997). The results from both signalling experiments are as predicted for a leaf developing in the same light conditions as the mature leaves. The stomatal density of the treatment and control plants were significantly different in both experiments one (ANOVA: F= 62.3, df = 3, 32, P< 0.001) and two (ANOVA:F= 10.8, df = 3, 16, P< 0.001). There was a 50.8% decrease in the stomatal density of the treatment group of experiment one (Fig. 3), and a 92% increase in the treatment group of experiment two (Fig. 4)." Extracted by eye from Figure 3, high light condition for control. Adaxial surface is the side of the leaf facing the stem. Upward, sun-facing surface in tobacco.