Spatial dependence for hydrogen peroxide-directed signaling in light-stressed plants.

摘要

This paper examines the role of the reactive oxygen species (ROS) hydrogen peroxide (H2O2) as a signalling molecule involved in plant response to a sudden change in light intensity in a spatial context. One view presented is the compartment-specific H2O2-mediated signalling that is associated with acclimatization to high light. It is proposed that a spatial component to signalling is maintained by limiting the accumulation of H2O2 to its sites of production, thereby allowing H2O2 to initiate distinct signals depending on its subcellular origin. Conversely, breakdown in the integrity of this spatial component, such that H2O2 diffuses into other subcellular compartments, would promote oxidative stress and trigger signalling associated with cell death..