Transgenic Plants and Antioxidative Defense: Present and Future?

摘要: Environmental stresses considerably limit plant growth, distribution, and productivity. Biological systems generate a range of different reactive oxygen species (ROS) like superoxide (O2 •−), hydroxyl radical (•OH), hydrogen peroxide (H2O2), during the course normal metabolic reactions. If it is not effectively rapidly removed, ROS damages wide macromolecules, ultimately leading to cell death. are also generated in response various biotic abiotic stresses. Cells have evolved both enzymatic nonenzymatic defense mechanisms protect cells from lethal effects free radicals. ROS-scavenging enzymes, such as dismutase (SOD), catalase (CAT), peroxidase (POD) that play crucial role regulating accumulation cells. Transgenic plants expressing specific gene candidates been proven increase tolerance environmental significantly. In recent years, several efforts made improve oxidative stress by over-expressing or bacterial genes coding either for enzymes modulating cellular antioxidant capacity. this chapter, we discussed some significant reports on transgenic with altered capacity mainly focusing new insight into mechanisms. Finally, future focus research combat has briefed.