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Gas exchange parameters in wild-type (WT) and CKX1 transgenic tobacco plants during drought stress. Stomatal conductance for water vapour, g s, and net photosynthetic rate, A, were measured in fully expanded leaves of tobacco WT, W6:CKX1, and 35S:CKX1 plants in a closed cabinet at 40 °C. (A and B) PAR 130 μmol m–2 s–1, (C and D) PAR 300 μmol m–2 s–1. Measurements were recorded every 30 s over a 1.5h period for three plants of each genotype.
