Redox reactions are evolutionarily conserved signaling principles, occurring in prokaryotes and eukaryotes. The most important redox molecules are reactive oxygen and nitrogen species (ROS and RNS). Due to their short half-life, high diffusion capability and ability to react with different componentsinthecell,ROS,andRNSarekeysignalingmoleculesparticipatinginvarioussignaling pathways involved in the regulation of transpiration, gas exchange, biotic/abiotic stress response, cell death, germination, and plant growth and development (Del Río, 2015; Mhamdi and Van Breusegem, 2018; Waszczak et al., 2018; Sánchez-Vicente et al., 2019; Smirnoff and Arnaud, 2019; Sharma et al., 2020). In detail, they modify proteins and cellular metabolites and in this way alter their activity, function, stability, and/or intracellular localization (Mata-Pérez et al., 2017; Mittler, 2017; Czarnocka and Karpinski, 2018; Umbreen et al., 2018; Gupta et al., 2020). This Research Topic introduces active research in this rapidly moving field, including functional analysis of these redox-active molecules as well as technical developments in redox research.
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