Involvement Of Reactive Oxygen Species In The UV-B Damage To The Cyanobacterium Anabaena Sp.
Y. Y. He, D. Häder
Published 2002 · Chemistry, Medicine
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Reactive oxygen species (ROS) are involved the damage of living organisms under environmental stress including UV radiation. Cyanobacteria, photoautotrophic prokaryotic organisms, also suffer from increasing UV-B due to the depletion of the stratospheric ozone layer. The increased UV-B induces the production of ROS in vivo detected by using the ROS-sensitive probe 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA). Ascorbic acid and N-acetyl-L-cysteine (NAC) scavenged ROS effectively, while alpha-tocopherol acetate or pyrrolidine dithiocarbamate (PDTC) did not. The presence of rose bengal and hypocrellin A increased the ROS level by photodynamic action in the visible light. The presence of the herbicide, 3-(3,4-dichlorophenyl)-1,1-dimethyl urea (DCMU), increased ROS production slightly, and ROS formation was greatly enhanced by the addition of methyl viologen due to the fact that this redox system diverts electrons from PSI to oxygen and thus forms ROS. UV-B induces ROS generation by photodynamic action and inhibition of the electron transport by damaging the electron receptors or enzymes associated with the electron transport chain during photosynthesis.
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