Abstract
Salicylic acid (SA) has been reorganized as a signaling molecule in plants involved in biotic and abiotic stresses. This chapter covers the recent progress of SA-mediated signaling pathways in response to Cd stress. Preliminary treatment of plants with low concentrations of SA manifested alleviation effects on Cd toxicity. However, excess exogenous SA exposure or abnormal endogenous SA levels aggravated Cd-induced oxidative stress. Here, we summarized the possible mechanisms of the SA-mediated alleviation of Cd toxicity in plants in terms of plant growth, antioxidant systems, Cd immobilization, Cd and other elements’ uptake, photosynthesis, GSH and PC synthesis, and cell death. Although the biochemical mechanisms are mainly focused on its signaling role by altering the levels of reactive oxygen species of plant cells, several questions remain unanswered at both the theoretical and practical levels.
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