Reactive oxygen species (ROS) are highly reactive by-products
of aerobic metabolism and can lead to oxidative damage of cells.
Plants possess a complex ROS network consisting of antioxidant
enzymes, antioxidants, and ROS producing enzymes. This network
operates to keep ROS levels under control [1]. Although it is known
that high concentrations of ROS can cause irreversible damage and
cell death, they can also influence signaling and gene expression
controlling several biological pathways [2].