Figure 3

Photosynthesis rate (Pr, A), transpiration rate (Tr, B), Water use efficiency (WUE, C), and stomatal conductance (SC, D) contents affected by Si-NPs application (0, 300, 600, and 900 mg/L) under drought stress at critical growth stages (CK Control, DTS Drought at tillering stage, DFS drought at flowering stage, DGFS drought at grain filling stage) of wheat.