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Photosynthetic induction (A, C, E) and stomatal conductance (B, D, F) in dark-adapted tomato leaves, as affected by Ca (A, B), Tleaf (C, D) and VPDleaf-air (E, F). Irradiance was raised from 0 to 1000 µmol m−2 s−1 at time = 0 and kept steady for 60 min. In A, C and E, the first 30 min of induction are shown. Mean ± SE (n = 5).
