H2O2 priming promotes salt tolerance in maize by protecting chloroplasts ultrastructure and primary metabolites modulation

Hydrogen peroxide priming has emerged as a powerful strategy to trigger multiple responses involved in plant acclimation that reinforce tolerance abiotic stresses, including salt stress. Thus, this study aimed investigate the impact of foliar H2O2 on physiological, biochemical, and ultrastructural traits related photosynthesis salt-stressed plants. Besides, we provided comparative leaf metabolomic profiles Zea mays plants under such conditions. For this, H2O or pretreated were grown saline conditions for 12-days. Salinity drastically affected photosynthetic parameters structural chloroplasts integrity, also increased reactive oxygen species contents promoting disturbance metabolism when compared non-saline Our results suggest H2O2-pretreated improved performance avoiding salinity-induced energy excess damage by preserving stacking thylakoids. It displayed modulation some metabolites, arabitol, glucose, asparagine, tyrosine, which may contribute maintenance osmotic balance reduced oxidative Hence, our brings new insights into an understanding salinity based metabolite modulation.