ROS Signals Trigger Programmed Cell Death

Aerenchyma Cells

Genetically controlled cell death can be triggered by different types of ROS, including hydrogen peroxide H2O2 , singlet oxygen 1O2 , and superoxide radicals O2- . Hydrogen peroxide is the most prominent ROS signal Fig. 1 . H2O2-dependent PCD is observed during a number of developmental processes, including tracheary elements maturation, aleurone cell layer elimination in monocots, lysigenous aerenchyma formation Gadjev et al. 2008 . A burst of H2O2 is observed also during the hypersensitive...