Figure 5.

Antioxidant enzyme activities of maize seedlings under drought-stress conditions in combination with melatonin in different levels of nitrogen. CK; Well-watered control without (melatonin) MT, DS; Drought stress without MT, MT; Drought stress + 100 µM MT, MT + N1; MT 100 µM + 200 kg N ha⁻¹, MT + N2; MT-100 µM + 250 kg N ha⁻¹, and MT + N3; MT-100 µM + 300 kg N ha⁻¹. Vertical bars represent ± S.D. (n = 3, biological replicates). Different letters indicate significant differences as determined by the LSD test (p ≤ 0.05).