Content of (A) thiobarbituric reactive substances (TBARS); (B) proline; (C) reduced glutathione (GSH); and (D) oxidized glutathione (GSSG) in wheat seedlings of six Croatian wheat varieties (Silvija, Rujana, Bubnjar, Fifi, Anđelka, and Pepeljuga) under 10 and 20% PEG treatment. Expression data are presented as means of three independent biological replicates, and the error bars indicate standard deviations. Differences among treatments in each variety separately were assessed by a one-way analysis of variance (ANOVA), followed by the Dunnett post hoc test. The Dunnett test was performed at a significance level of 5, 1 and 0.1% (* p < 0.05, ** p < 0.01, *** p < 0.001).