Abstract

Salicylic acid (SA), is an important phytohormones that plays a role in response to biotic stresses and pathogenesis. Apart from this role, recent studies have demonstrated that SA also participates in the signaling of abiotic stress responses, such as drought, high and low temperature, salinity, ozone, UV radiation, and heavy metals. In addition, abiotic stresses also induce endogenous SA accumulation. The appropriate application of SA could provide protection against several types of environmental stresses. SA may cause oxidative stress, partially through accumulation of hydrogen peroxide. A low concentration of hydrogen peroxide also improves the antioxidative capacity of plants and stimulates the synthesis of protective compounds, leading to enhanced tolerance to abiotic stresses. The effect of SA application depends on numerous factors such as the species and developmental stage of the plant, the mode of application, and the concentration of applied and endogenous SA levels. This chapter reviews the effects of SA on different abiotic stresses, and possible mechanisms for abiotic stress responses controlled by SA.

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