Fig.4

Interaction effect of osmotic stress (control, − 0.4, and − 0.8 MPa) × arbuscular mycorrhiza (AM) × variety and on catalase (CAT) (a), peroxidase (POD) b and polyphenol oxidase (PPO) (c) activities of chamomile. Means within a column followed by the different letter are significantly different at P ≤ 0.05. Standard error of the mean (n = 4)