The cultivated area of soybean has increased worldwide in past decades, including regions with saline soils, strongly decreasing growth and productivity. The use of amino acids (AAs) as buffering compounds against stressful conditions can be a useful strategy to mitigate salt stress in these regions. This study aimed to evaluate the effects of foliar application of AA mixtures on the growth, physiology, and biochemistry traits of salt-stressed soybean plants. A pot experiment was designed as a factorial scheme (4 × 3) in a randomized complete design (RCD). Treatments consisted of four concentrations of AA mixtures of a non-VA application, 0.4 mL L⁻¹, 0.8 mL L⁻¹, and 1.2 mL L⁻¹ (VIUSID Agro^® (VA) source), which were combined with non-salt stressed and salt-stressed groups (50 and 100 mmol L⁻¹ NaCl), to analyze improvement in growth and potassium (K⁺) accumulation, maintenance of relative water content (RWC), net photosynthesis rate (A), transpiration (E), stomatal conductance (gs), and chlorophyll content, and increase of proline accumulation and water use efficiency (iWUE). Moderate and high salinity induced a notable increase in oxidative and ionic biomarkers, coupled with higher Malondialdehyde (MDA) concentration and Na⁺ accumulation. Alternatively, soybean growth, K⁺ accumulation, and physiological and biochemical parameters were decreased under salinity. Foliar spraying of AAs drastically increased osmolyte accumulation associated with sustained iWUE and RWC, increased proline accumulation, and improved A, E, gs, and chlorophyll content. Greater outcomes were achieved with the foliar spraying of amino acids at 1.2 mL L⁻¹. Collectively, foliar application of AA mixtures plays an important role in salt stress remediation by modifying important physiological and biochemical processes, thereby resulting in a higher growth of soybean plants.

The global landscape is marked by climatic, socioeconomic, and demographic complexities, and enhancing food production through byproducts has emerged as a powerful strategy to address these challenges. This review aimed to analyze the potential impacts of VIUSID^® agro, an amino acid–based growth promoter, on plant growth, productivity, and tolerance to salt stress. A quantitative systematic review was conducted utilizing databases such as Web of Science, Scopus, and Google Scholar. The research papers highlighted the positive effects of VIUSID^® agro on growth and production, as well as on physiological and biochemical indices related to salt stress across various crops. Furthermore, this biostimulant can be administered in different doses and through various application methods. The review also examined its effects during the ex vitro acclimatization phase and in tissue culture. The results demonstrated enhanced crop growth, increased biomass accumulation, modulation of photosynthesis, improved enzymatic antioxidant defenses, and maintenance of ionic homeostasis, all contributing to superior crop performance. These findings suggest that VIUSID^® agro is beneficial for a wide range of crops, with its effectiveness primarily attributed to its rich amino acid composition, which influences and modulates various physiological and biochemical processes within plant cells.