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Oxidative stress regulation in lichens and its relevance for survival in coastal habitats

Abstract : Lichens are symbiotic systems able to survive in harsh conditions like those on coastal rocks with rapid changes in the concentration of salt, immersion, desiccation-rehydratation cycle, wind, waves and herbivorie. These stresses are at the origin of reactive oxygen species (ROS) production in lichens. Physical barriers, enzymatic systems and cellular contents of glutathione, ascorbic acid and tocopherols are involved in lichen defence systems against ROS. But which role have specific lichen compounds, e.g.: the depsides, depsidones, dibenzofuranes, diphenylethers as antioxidants? In order to answer this question, antioxidant studies were recorded and analysed for studies for lichens that occur on coastal rocks. Based on the methods used in the experiments (hydrogen atom transfer (HAT), electron transfer (ET), enzymatic assays, specific ROS scavenging, in vivo assays), lichen compounds seemed to be poor hydrogen acceptors and electron donors but appeared as potent ROS specific scavengers, they might act as antioxidants as proved by the positive results of many lichen extracts in antioxidant assays.
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Submitted on : Thursday, June 12, 2014 - 10:53:49 AM
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Françoise Lohézic-Le Dévéhat, Holger Thüs, Marie-Laurence Abasq, David Delmail, Joël Boustie. Oxidative stress regulation in lichens and its relevance for survival in coastal habitats. Advances in Botanical Research, Elsevier, 2014, 71, pp.467-503. ⟨10.1016/B978-0-12-408062-1.00016-0⟩. ⟨hal-01005197⟩



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