Activities of nitrogen metabolism enzymes in leaves of tomato seedlings grown in nutrient solution or in 75 mM saline-alkaline solution (nutrient solution with 75 mmol/L saline-alkaline solution;NaCl:Na
= 1:9:9:1) with or without 0.25 mmol/L Spd. Data represent means of three replicates. Bars indicate ± SE (P < 0.05). A delegated NR activity, B delegated NiR activity, C delegated GOGAT activity, D delegated GS activity, E delegated GOT activity, F delegated GPT activity, G delegated GDH activity. Bars represent the mean ± SE (P < 0.05) of at least three independent experiments.