Fig. 5

Stomatal characteristics in the abaxial leaves of the three tomato cultivars under four days of control, drought, heat and combined stress. Different sub-graphs represent a stomatal length, b stomatal width, c pore length, d pore width, e stomatal area, f pore area and g stomatal number. The data represent mean values ± SE (n = 4). Different small letters above the bars indicate significant differences (P < 0.05)