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Main conclusionsA comparative study of isolated vs. lichenizedTrebouxiasp. showed that lichenization does not influence the survival capability of the alga to the photo-oxidative stress derived from prolonged desiccation. Coccoid algae in the Trebouxia genus are the most common photobionts of chlorolichens but are only sporadically found in soil or bark outside of a lichen. They all appear...
Lichens are among the best biomonitors of airborne pollutants, but surprisingly they reveal high tolerance to ozone (O 3 ). It was recently suggested that this might be due to the high levels of natural defences against oxidative stress, related to their poikilohydric life strategy. The objective of this work is to give a thorough description of the biochemical and physiological mechanisms...
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