Possible role of free oxidation processes in the regulation of reactive oxygen species production in plant mitochondria.
The non-coupled substrate oxidation mediated by components of the electron transport chain that are not coupled to energy accumulation (such as plant alternative oxidase and rotenone-insensitive NADH dehydrogenases) and uncoupled respiration are peculiar features of plant mitochondria. The physiological significance of such energy-wasting oxidation processes is still debated. It is proposed that non-coupled oxidation could regulate the level of reduction of components of the electron transport chain and the rate of one-electron reduction of oxygen, thereby affecting the rate of formation of reactive oxygen species.
Popov
V N
VN
Department of Plant Physiology and Biochemistry, Voronezh State University, Voronezh 394693, Russia. pvn@main.vsu.ru
D008928:Mitochondria / Q000378:metabolism*; D010084:Oxidation-Reduction; D010944:Plants / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism*
D017382:Reactive Oxygen Species