Figure 1.

Effect of nitrate concentration on NRA and nitrate content: Leaf nitrate reductase activity (NRA) (A) and nitrate content (B) was measured in PB and PJK after 2 h, 24 h, 3 d, 7 d and 15 d of various nitrate treatments (0.25 mM KNO₃, 2 mM KNO₃ and 4 mM KNO₃). For control conditions (0 mM KNO₃), equal amount of KCl was supplied to the plants. The vertical bars indicate mean ± S.E (n = 3). Asterisk on the top of the bar indicates level of significance (*p-value < 0.05, student’s t-test).