Fig. 3From: Adaptive responses of carbon and nitrogen metabolisms to nitrogen-deficiency in Citrus sinensis seedlingsEffects of N supply on mean (± SE, n = 4) activities of N assimilation-related enzymes in leaves and roots. a and f Leaf and root nitrate reductase (NR). b and g Leaf and root NADH-dependent glutamate 2-oxoglutarate aminotransferase (NADH-GOGAT). c and h Leaf and root glutamate oxaloacetate aminotransferase (GOT). d and i Leaf and root glutamate pyruvate aminotransferase (GPT). e and j Leaf and root glutamine synthase (GS)Back to article page