Figure 3.

Net photosynthetic rate (P_N) (A), stomatal conductance (g_s) (B), transpiration rate (E) (C) and intrinsic water-use efficiency (WUE_i) (D) in well-irrigated (light grey bars) and drought-stressed (dark gray bars) lulo (Solanum quitoense Lam.) plants sprayed with 1, 2, 4 and 8 mL·L⁻¹ of brassinosteroid analogue (DI-31) at 80 days after transplanting (DAT). Each bar chart summarizes the mean of five data ± standard error (n = 5). Bars followed by different letters indicate statistically significant differences according to the Tukey test (p ≤ 0.05).