Fig. 2
a Net photosynthetic rate (PN), (b) stomatal conductance (gs), (c) transpiration rate (e), (d) intracellular CO2 concentration (Ci) and (e) leaf temperature in the first fully expanded leaves of tomato ‘OB’ from the top during different treatments. ‘a [CO2]’ and ‘e [CO2]’ indicates 400 ppm and 800 ppm [CO2]. ‘Control’, 25/20 °C; ‘Combined stress’, 35/30 °C (heat stress, HS) + no irrigation (drought stress, DS) for 12 h; ‘Recovery from DS’, 35/30 °C + irrigation for 16 h; ‘Recovery from HS’, 25 °C + irrigation for 4 h. The data represent average values ± SD (n = 4). Different small letters showed significant differences (P < 0.05)