Dear Colleagues,

Reactive oxygen species (ROS) comprise a family of related compounds that are found in both prokaryotes and eukaryotes. In animals, ROS have been implicated in the control of cell viability, disease and death. There is emerging evidence of the distinct roles of individual ROS depending on their site of production and physicochemical properties. For example, mitochondrial ROS are major effectors of antimicrobial immunity. Chloroplast-derived singlet oxygen, as one form of ROS, is presumed to be part of a genetically programmed cell death pathway in plants, and ROS also play important roles in plant–fungal interactions. Changes in the concentrations, sources and sinks of ROS have been reported to affect marine ecosystem dynamics. New molecular tools have been developed to measure ROS accumulation in vivo and define the plethora of mechanisms underlying ROS’ action in nature. It is the aim of this Special Issue to highlight these aspects.

Dr. Steffen Reinbothe
Guest Editor

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• ROS production in prokaryotes and eukaryotes
• Mitochondrial ROS and their mode of action
• Chloroplast ROS and their functions
• Role of ROS in controlling cell viability, aging, and disease
• Cell death regulation by ROS
• ROS dynamics in organismic interactions