Production sites of reactive oxygen species (ROS) in organelles from plant cells.- What do the mitochondrial antioxidant and redox systems have to say under salinity, drought and extreme temperature? -- ROS as key players of abiotic stress responses in plants -- Redox regulation and antioxidant defence during abiotic stress: What have we learned from Arabidopsis and its relatives? -- ROS signaling: Relevance with site of production and metabolism of ROS -- Heavy metal-induced oxidative stress in plants: Response of the antioxidative system -- Arsenic and chromium induced oxidative stress in metal accumulator and non-accumulator plants and detoxification mechanisms -- Phytochelatin and oxidative stress under heavy metal stress tolerance in plants -- General roles of phytochelatins and other peptides in plant defense mechanisms against oxidative stress/primary and secondary damages induced by heavy metals -- Role of polyphenols as antioxidants in native species from Argentina under drought and salinization -- Reactive oxygen species and plant disease resistance -- Modulation of the ascorbate-glutathione cycle antioxidant capacity by post-translational modifications mediated by nitric oxide in abiotic stress situations -- ROS-RNS-phytohormones network in root response strategy -- Relationship between changes in contents of nitric oxide and amino acid particularly proline in plants under abiotic stress -- Transgenic plants and antioxidative defense: Present and future?.