Abstract
Reactive oxygen species (ROS) are toxic derivatives of atmospheric oxygen used by plant cells to control many different biological processes, including growth, development, and response to biotic and abiotic stimuli. Because of their toxicity, as well as their important signaling role, the steady-state level of ROS in cells is tightly regulated by a network of genes termed the “ROS gene network”. In the flowering plant Arabidopsis thaliana, the ROS gene network includes more than 150 genes that manage the level of ROS in cells. The ROS network is highly dynamic and redundant, and encodes for ROS-scavenging as well as ROS-producing proteins. Recent studies have unraveled some of the key players of the network and shed light on some of the questions related to its mode of regulation, its protective roles, and its modulation of signaling networks that control growth, development, and stress response. In this chapter we will describe some of these findings.
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