Dear Colleagues,

Reactive oxygen species (ROS) are generated in plants from seed germination through senescence processes, and their concentration is the result of the balance between the production and scavenging of these species. ROS play a dual role in vivo in plant physiology depending on their concentration in cells; they can act as signaling molecules during several cellular processes, or they can cause the deterioration of cellular components (protein, nucleic acids, lipids, etc.) when they reach high levels in the cells. Both biotic and abiotic adverse conditions also enhance the levels of ROS in plants.

ROS can be produced in different plant cell compartments by several enzymes, such as NADPH-oxidases, other oxidases, peroxidases, etc., or as a result of electron transport processes. To counteract their effect and maintain the cell redox homeostasis, plants have a complete and powerful set of enzymatic and non-enzymatic antioxidant systems. Among the enzymatic antioxidants are superoxide dismutase, catalase, peroxidases, etc., whereas low-molecular mass metabolites, such as ascorbic acid, glutathione, tocopherols, carotenoids and phenolic compounds, are members of the non-enzymatic antioxidant systems.

This Special Issue will focus on all these aspects of ROS production, including ROS as signaling molecules and ROS scavenging systems in physiological processes and in response to adverse situations. Original research papers and reviews are welcome.

Dr. Pedro Piedras
Dr. Gregorio Gálvez-Valdivieso
Guest Editors

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• reactive oxygen species
• antioxidant enzymes
• antioxidant molecules
• oxidative stress
• ROS production
• ROS scavenging
• ROS signaling