Fig. 4.

Relative water content (RWC), maximum efficiency of PSII photochemistry (F_v/F_m ratio) and levels of α- and γ-tocopherol (α-T and γ-T, respectively) in young and mature leaves of the wild type, and vte1 and vte4 mutants of A. thaliana exposed to control, salt stress or water stress conditions for 7 d. Data are the mean ± SE of n = 4 experiements. Significant differences between genotypes, leaf type and their interaction (genotype × leaf type) are given in the panels (ANOVA, P ≤ 0.05). NS, not significant.