g. Box plots display lateralization index (fluorescent signal detected on apical/basal membranes vs inner/outer membranes) of P2wt, P2D and P2A roots transferred to ammonium (grey) or nitrate (red) supplemented medium. At least 24 cells from 5 roots were analyzed per genotype per treatment. The statistical significance was evaluated with ANOVA at p<0.05. The box chart components are defined as; box (25%-75%), central band (median line), central box (mean) and the range is within 1.5IQR. 