Fig. 4From: Drought stress had a predominant effect over heat stress on three tomato cultivars subjected to combined stressLeaf pigment content per unit area of the three tomato cultivars under four days of control, drought, heat and combined stress. Different sub-graphs represent a chlorophyll a, b chlorophyll b, c carotenoid and d chlorophyll a/b. The data represent mean values ± SE (n = 4). Different small letters above the bars indicate significant differences (P < 0.05)Back to article page