Table 3 The interaction effect of deficit irrigation × TiO₂-NPs on antioxidant enzymes activity (Ascorbate peroxidase (APX) and catalase activities (CAT)):

Deficit irrigation	TiO₂-NP (ppm)	Catalase (μmol H₂O₂ mg⁻¹ protein min⁻¹)	Ascorbate peroxidase (unit. g⁻1fw)
Cont. (100% FC)	0	60.69^ef*	3.73^e
	15	67.34^bc	4.72^cd
	30	66.68^bcd	4.41^d
PRD1	0	57.48f.	5.17^bc
	15	65.44^cde	5.71^a
	30	69.99^abc	5.12^bc
PRD2	0	61.28^def	5.26^ab
	15	58.02f.	5.53^ab
	30	70.21^abc	5.08^bc
SDI	0	66.50^bcd	5.57^ab
	15	71.77^ab	5.48^ab
	30	75.32^a	5.76^a

*Means followed by same letters in each column does not have a significant difference based on the LSD test (p ≤ 0.01).

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