Fig. 2

Chlorophyll a fluorescence parameters, Fv/Fm A) and performance index (PI), B) in ‘Porto’ and ‘Sunny wind’ plants exposed to 0, 50, 100 or 200 mM NaCl. Data are shown as mean with at least 5 independent biological replicates and error bars indicate standard error. Data were subjected to two-way ANOVA and differences among means were determined using Tukey’s post-test. Different letters indicate statistical differences for p < 0.05