HO priming induces proteomic responses to defense against salt stress in maize.

Key Message: HO priming reprograms essential proteins' expression to help plants survive, promoting responsive and unresponsive proteins adjustment to salt stress.

Abstacrt: Priming is a powerful strategy to enhance abiotic stress tolerance in plants. Despite this, there is scarce information about the mechanisms induced by HO priming for salt stress tolerance, particularly on proteome modulation.

HO 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 to abiotic stresses, including salt stress. Thus, this study aimed to investigate the impact of foliar HO priming on the physiological, biochemical, and ultrastructural traits related to photosynthesis of salt-stressed plants. Besides, we provided comparative leaf metabolomic profiles of Zea mays plants under such conditions.