Fig. 2From: Adaptive responses of carbon and nitrogen metabolisms to nitrogen-deficiency in Citrus sinensis seedlingsEffects of N supply on mean (± SE, n = 4) concentrations of NH4+-N, NO3−-N, ratios of NH4+-N/NO3−-N, and concentrations of TSPs in leaves and roots. a and e Leaf and root NH4+-N concentrations. b and f Leaf and root NO3−-N concentrations. c and g Leaf and root ratios of NH4+-N/NO3−-N. d and h Leaf and root concentrations of total soluble proteins (TSPs)Back to article page