ROS and Plant Membrane Rafts
Although excess reactive oxygen species (ROS) are toxic, physiological concentrations of ROS may function as signaling molecules to mediate various responses. However, given that ROS are diffusible and short-lived, localizing the ROS signal at a precise subcellular location is essential for stimulation of specific redox signaling. In animals, recent studies have indicated lipid microdomain platforms or lipid rafts may be importantly implicated in redox signaling of a variety of cells in response to agonists or stimuli (for a review, see Li and Gulbins 2007). The plant plasma membrane (PM) is in charge of sensing the various environmental modifications faced by the plant cell and triggering the appropriate physiological responses. It thus exemplifies this requirement for an extremely fine-tuning of ROS production in plants, which has been evidenced as a mediator in many different biotic or abiotic stresses leading to significantly different responses. The spatial compartmentalization of ROS-producing enzymes in specialized domains of the plant PM could be one key element of such a regulation.
KeywordsReactive Oxygen Species Reactive Oxygen Species Production NADPH Oxidase Lipid Raft Cytochrome B561
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