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It is now clear that reactive oxygen species (ROS), such as hydrogen peroxide (H 2 O 2 ), and reactive nitrogen species, such as nitric oxide (NO), are produced by plant cells in response to a variety of stresses, including pathogen challenge. Such molecules may be involved in direct defence mechanisms, such as cross-linking of plant cell walls, or as antimicrobial agents. However,...
The nature and origin of the reactive oxygen species (ROS) involved in the early part of Ultraviolet-B (UV-B)-induced signaling pathways were investigated in Arabidopsis thaliana using a range of enzyme inhibitors and free radical scavengers. The increase in PR-1 transcript and decrease in Lhcb transcript in response to UV-B exposure was shown to be mediated through pathways involving hydrogen peroxide...
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