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The N cycle, uptake, and assimilation. The main sources of soil N are N fixation, synthetic fertilizers, and organic decomposition. N uptake in the form of NO3− or NH4+ through NRTs and AMTs, respectively. GS catalyzes glutamine synthesis from glutamate and NH4+ ions. At the same time, GOGAT catalyzes the synthesis of glutamate from glutamine and α-ketoglutarate, and thus, GS and GOGAT play central roles in the N metabolism and assimilation in plants.
