Abstract
Salicylic acid (SA) is a simple phenolic acid with hormonal function synthesized from the amino acid phenylalanine or chorismate depending on the plant species, developmental stage and growth conditions. This compound plays a key role in plant growth and development, and in plant responses to abiotic stresses such as salinity and drought stress. Under these environmental constraints, plants synthesize a number of secondary metabolites, including flavonoids and terpenoids, with a defence-related function. Here, we will discuss the role of SA in modulating plant responses to abiotic stress, particularly as an inducer of defence responses against salinity and drought stress. Emphasis will be put on discussing the SA signalling pathways that affect flavonoid and terpenoid metabolism as defense compounds against stress.
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