Salicylic Acid: Plant Defence and Stress Signalling

Salicylic acid is a plant hormone primarily associated with defence responses and stress signalling.
Salicylic acid is involved in:
‣ Systemic acquired resistance (SAR)
‣ Response to pathogens
‣ Regulation of stress-related pathways
‣ Interaction with other phytohormones
It acts as a signalling molecule that activates plant defence mechanisms under both biotic and abiotic stress conditions.

Salicylic acid is generally more stable than some other phytohormones, but can still be affected by matrix complexity and extraction conditions.

Measurement of salicylic acid is important for:
‣ Evaluating plant stress responses
‣ Supporting development of stress-resistance products
‣ Monitoring biostimulant efficacy
‣ Understanding plant signalling pathways