Effects of PEG6000 and NaCl treatment on the levels of H2O2 and MDA, the activity of some antioxidases, and proline contents in Arabidopsis overexpressors of TaTIP4;1. (A) H2O2 levels. (B) MDA levels. (C–E) The activities of CAT, POD and SOD, respectively. (F) Proline levels. Fifteen-day-old WT, VC and TaTIP4;1 overexpression seedlings were treated with water or 200 mM NaCl for 7 d. Levels of H2O2 and MDA, the activity of some antioxidases, and proline contents were assayed. Data are mean ± SD (n ≥ 3). Distinct lowercase letters above the error bars reveal that the values of various plants significantly differed from each other by one way ANOVA and Tukey’s HSD test (p < 0.05).