Figure 1.

Forest plot showing the effect size ($\ln \frac{R}{R}$) on several stress-related physiological parameteres of transgenic plants for proline synthesis genes compared to non-transgenic plants under drought and salt stress. Pro = Proline content; CHL = Chlorophyll content, POD = Peroxidase activity; SOD = Superoxide dismutase activity; MDA = Malondialdehyde activity; CAT = Catalase activity; APX = Ascorbate peroxidase activity; RWC = Relative water content; Sto = Stomatal conductance: Rec = Relative electric conductivity; Sur = Survival rate. ** p < 0.01, *** p < 0.001, n.s. = non statistically significant.