Fig. 3. Total soluble protein (A), nitrate reductase activity (B) and phenylalanine ammonia-lyase (PAL) activity (C), in spring wheat leaves during the heading stage,subjected to increasing doses of thiamethoxam via seed treatment. Vertical bars
indicate the SE (n = 10, ⁄P < 0.05 and ⁄⁄P < 0.01).