Whole-plant daily transpiration rate and relative transpiration of TOM-NtAQP1 and control plants grown under normal irrigation and salt stress in a controlled greenhouse. A, Mean daily transpiration rate (±se; normalized to leaf area) of TOM-NtAQP1 (gray line; n = 3) and control plants (black line; n = 3) under normal irrigation regime. B to D, Mean daily transpiration rate (±se; normalized to leaf area) in plants after 1 d (B) and 3 d (C) of 100 mm NaCl salinity stress and on day 1 of recovery (D; receiving normal irrigation again; nNtAQP1 = 3, ncontrol = 3). All insets represent mean daily relative (rel.) transpiration (%), normalized to VPD and leaf area, of the plants presented in the graphs. Data are given as means ± se for each 10th sampling point. When not seen, se is smaller than the symbol. * Significant difference between means (t test, P < 0.05).