Fig. 4
Fv/Fm in the first fully expanded leaves of tomato (a) ‘OB’, (b) ‘LA2093’ from the top during different treatments. The stage of stress, recovery from DS and recovery from HS lasted 14 h, 18 h and 6 h, respectively. ‘a [CO2]’, 400 ppm [CO2] + 25/20 °C + irrigation; a [CO2] + combined stress’, 400 ppm [CO2] + 35/30 °C + no irrigation; ‘e [CO2]’, 800 ppm [CO2] + 25/20 °C + irrigation; e [CO2] + combined stress’, 800 ppm [CO2] + 35/30 °C + no irrigation. ‘Recovery from DS’, 35/30 °C + irrigation; ‘Recovery from HS’, 25 °C + irrigation. The data represent average values ± SD (n = 4). Different small letters showed significant differences (P < 0.05)