Antioxidant enzyme APX (a), CAT (b), GPX (c), and SOD (d) activity under SA pretreatments (0.1, 0.75 and 1.5 mM), exposure duration (7, 14, 21 and 28 day) in cell suspension cultures of A. graveolens. Data represents the mean ± standard error (n = 3) and were analyzed by one way ANOVA. The values are significant at 0.01 level