Where is salicylic acid in plants produced?

Salicylic acid in plants is primarily produced in the leaves, although it can also be found in other tissues such as stems and roots. The synthesis occurs in response to various stress factors, including pathogen attack and environmental stresses. It is generated through the phenylpropanoid pathway, where it is derived from phenylalanine or through the shikimic acid pathway. Salicylic acid plays a crucial role in plant defense mechanisms and systemic acquired resistance.