Originally conceived as harmful metabolic byproducts, reactive oxygen species (ROS) are now recognized as an integral part of numerous cellular programs. Thanks to their diverse physicochemical properties, compartmentalized production, and tight control exerted by the antioxidant machinery they activate signaling pathways that govern plant growth, development, and defense. Excessive ROS levels are often driven by adverse changes in environmental conditions, ultimately causing oxidative stress. The associated negative impact on cellular constituents have been a major focus of decade-long research efforts to improve the oxidative stress resilience by boosting the antioxidant machinery in model and crop species. We highlight the role of enzymatic and non-enzymatic antioxidants as integral factors of multiple signaling cascades beyond their mere function to prevent oxidative damage under adverse abiotic stress conditions.

Center for Plant Systems Biology VIB 9052 Gent Belgium

Department of Plant Biotechnology and Bioinformatics Ghent University 9052 Gent Belgium

Phytophthora Research Centre Department of Molecular Biology and Radiobiology Faculty of AgriSciences Mendel University in Brno 61300 Brno Czech Republic

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Type-A response regulators negatively mediate heat stress response by altering redox homeostasis in Arabidopsis

Hydrogen peroxide-induced stress acclimation in plants