Fig. 4

Difference between transpiration (average in mm day⁻¹ m⁻² LA) at 100 % REW and at 20 % REW under 70 % radiation as a function of VPD (0.8 −3.1 kPa) for the four species studied (symbols as in Fig. 2). Performances of the models was expressed by r ² and P-value: *** <0.001, ** <0.01, * <0.05. We found no significant model fit for C. vulgaris