Signaling role of reactive oxygen species in plants under stress

The review considers the role of H2O2, 1O2, O 2 ·− , and the products of lipid peroxidation as signaling molecules in the processes of stress signal transduction in plants. The data concerning possible ROS participation in transduction of stress signals from chloroplasts to the nuclear genome, H2O2 involvement in transduction stress signals in cyanobacteria, and also the interactions between ROS and other signaling systems within the cell are presented. It is suggested that redox regulators, protein kinases/protein phosphatases, and transcription factors play a crucial role in the functioning of ROS-dependent signaling systems in the plant cell.