Figure 7.

A schematic comparison of (A) PEG-water stress and (B) nitrate agonists regulated N–NO coordinated underlying physiological phenomenon that shows the relationship of NO generation and scavenging to molecular mechanism of N-assimilation in B. juncea L. roots. Red boxes and narrow arrows represent decrease or down-regulation, while green boxed and wide arrows indicate increase or up-regulation in N–NO pathway. NO₃⁻ nitrate, NO₂⁻ nitrite, NH₄⁺ ammonium, SNO S-nitrosylated glutathione, GSNO S-nitrosoglutathione, NO nitric oxide, Glu glutathione, AA amino acids, GSSG oxidised glutathione, P5CS ∆¹-pyrroline-5-carboxylate synthetase, ProDH proline dehydrogenase, NR nitrate reductase, NiR nitrite reductase, NOSLE l-arginine dependent NOS-like enzyme activity, GSNOR S-nitrosoglutathione reductase, GS glutamine synthetase, GOGAT glutamate synthase, GDH glutamate dehydrogenase.