Figure 2.

(A) CO₂ assimilation rate (A_N, µmol CO₂ m⁻² s⁻¹), (B) stomatal conductance to water vapor (g_s, mol H₂O m⁻² s⁻¹), and (C) instantaneous water use efficiency (A_N/E) in the ungrafted plants (Var, variety “Sueca”) and Var grafted onto H92 or H90 (Var/H92 and Var/H90, respectively) under the water stress (WS) or control conditions (C). Measurements were taken at 10, 20, and 30 DAT (days after treatment). Data are the mean value for n = 4 for each plant type and treatment combination. Different letters indicate significant differences at p < 0.05 (LSD test) for each measurement time separately.