Salicylic acid - Hormone Synthetic Pathways and Genes in Arabidopsis

The production of salicylic acid in plants is associated with disease resistance. Salicylic acid induces the accumulation of pathogenesis-related (PR) proteins in a variety of plants. Salicylic acid biosynthesis was initially studied biochemically in tobacco leaves and a benzoic acid-dependent route has been discovered. More recent work using Arabidopsis mutants suggested that the isochorismate-dependent pathway is likely to be predominant in this species, which has been established for salicylic acid biosynthesis in some bacteria genera. The SA biosynthesis pathway through isochorismate in Arabidopsis is shown here.