Table 3.

Response of antioxidant activities (APX, GR, CAT, SOD) and ROS concentrations (H₂O₂, O₂⁻) to K, PEG and K:PEG. p-values of Kruskal–Wallis tests are shown. “+” for K, PEG and K:PEG indicates the following: (K) a significant increase in the respective trait from adequate (0.8 mM K⁺) to low (0.04 mM K⁺) K supply; (PEG) a significant increase in a trait from −PEG to +PEG under adequate K supply; (K:PEG) a significant increase in a trait from −PEG to +PEG under low-K supply. “-“ indicates a significant decrease in the above-mentioned traits. Statistics were performed on fully expanded young leaves samples taken between 11 and 19 DAO (n = 18).

	APX		GR		CAT		SOD		H2O2		O2−
	Milford
K	0.062		0.548		0.009	-	<0.001	+	0.002	+	<0.001	+
PEG	<0.001	+	<0.001	+	0.008	+	<0.001	-	<0.001	+	0.004	+
K:PEG	<0.001	+	<0.001	+	<0.001	+	0.025	+	0.016	+	<0.001	+
	Sahin-91
K	0.987		0.142		<0.001	-	0.023	+	<0.001	+	<0.001	+
PEG	0.002	+	<0.001	+	<0.001	+	0.206		0.023	+	<0.001	+
K:PEG	<0.001	+	<0.001	+	0.428		0.002	+	0.255		0.127