Fig. 4

Effects of glucose on amino acids and ammonia contents in pakchoi shoots a and roots b after a 12-h treatment with 1 mM NO₃ ⁻ + 1 mM NH₄ ⁺ + 1 mM glycine. Bars indicate mean values ± SE; n = 6. Different letters indicate significant differences between glucose levels (p < 0.05)