Nitrogen containing compounds and adaptation of plants to salinity stress

A number of nitrogen containing compounds (NCC) accumulate in plants expose d to salinity stress, The most frequently accumulating NCC include amino ac ids, amids, imino acids, proteins, quarternary ammonium compounds (QAC) and polyamines. The specific NCC that accumulate in saline environment vary wi th the plant species. Osmotic adjustment, protection of cellular macromolec ules, storage form of nitrogen, maintaining cellular pH, detoxification of the cells, and scavenging of free radicals are proposed functions for these compounds under stress conditions. NCC accumulation is usually correlated with plant salt tolerance, even though this correlation is based on unteste d hypotheses.