Cellular redox homeostasis as central modulator in plant stress response.- Plant cell redox homeostasis and reactive oxygen species.- Redox balance in chloroplasts as a modulator of environmental stress response: The role of ascorbate peroxidase and Nudix hydrolase in Arabidopsis.- Physiological processes contributing to the synthesis of ascorbic acid in plants.- Redox state in plant mitochondria and its role in stress tolerance.- Oxidative stress...