Fig. 2

Plot of the family norms of reaction (family plastic response) for the net CO₂ assimilation rate (A, μmol CO₂ m⁻² s⁻¹) (a), the stomatal conductance to water vapor (gs, mmol H₂O m⁻² s⁻¹) (b), Wi (=A/gs, μmol CO₂ mmol H₂O⁻¹) (c), the diameter at 5 cm (diam, cm) (d), the length of the terminal shoot (shoot, cm) (e), and the total height (height, cm) (f) as a function of the temporal variation of the log of the soil water content (log(SWC)) in the WS treatment. Each family (1062, 1058, 1046, 2082) is represented by a geometric symbol (o, Δ, +, ×). Only the lines corresponding to the significant norms of reaction are drawn. Solid, dashed, and dotted lines represent the norm of reaction for families 1062, 1058, and 1046, respectively. The significant correlation coefficient (R) for the pooled data are 0.27 for A (P = 0.0019), 0.56 for gs (P < 0.0001), − 0.56 for Wi (P < 0.0001), 0.34 for diam (P < 0.0001), 0.21 for shoot (P = 0.0185), and 0.21 for height (P = 0.0177)