NaCl stress affects the growth of mulberry plants and leads to an accumulation of ammonium in the leaves. The activity of glutamine synthetase, an enzyme involved in nitrogen metabolism, decreases in both leaves and roots under NaCl stress. On the other hand, the activity of glutamate dehydrogenase increases in leaves. The process of nitrate reduction is also affected, with roots showing increased activity while leaves show decreased activity. Overall, NaCl stress impacts the nitrogen metabolism of mulberry plants by hindering ammonium assimilation through the glutamine synthetase pathway and enhancing the glutamate dehydrogenase pathway.