The book explores the subject of proline, a crucial amino acid in mitigating salt stress in vegetables, highlighting its role as a cellular defense mechanism in conditions of high salinity. Based on studies carried out in saline stress scenarios, it has been shown that plants accumulate proline to preserve osmotic balance, protect cell structures and reduce oxidative damage. The research presented shows that exogenous application of proline or stimulation of its endogenous synthesis can increase the tolerance of vegetables to salinity, promoting growth and productivity even in unfavorable environments. This approach reinforces the relevance of proline as a promising biotechnological strategy for the sustainable management of crops in soils affected by salinity.