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Phytochimie de lichens du genre Stereocaulon : étude particulière de S. Halei Lamb et S. montagneanum Lamb, deux lichens recoltés en Indonésie

Abstract : Morphological and phylogenetic along with phytochemical analysis have been conducted on nine species of fruticose lichens. Stereocaulon samples have been collected from tropical (Indonesia, Reunion Island) and boreal areas (France, Italy). Series of records and observations were compared to clarify the taxonomy and the botanical identification of these lichens and resulted in the selection of two species for extensive investigation of their secondary metabolites. The phytochemical study was conducted on S. halei and S. montagneanum, which were collected from the Sumatra Island. Among the fourteen metabolites isolated, some are common to these two species and correspond to the abundant depside atranorin and associated mono-aromatic derivatives. Depsidones differnetiated theses species as lobaric acid and derivatives where found in S. halei while stictic acid and derivatives have been identified in S. montagneanum. The lobariol carboxylic acid was isolated for the first time from lichens and characterized as conformers. The different metabolic profiles of S. halei and S. montagneanum were in accordance with the phylogeny studies distinguishing these two related species in the Aciculisporae and Holostelidium subgenera, respectively. Despite uneven activities as photoprotective compounds, the 6 metabolites obtained in suitable amounts to be tested failed to be active. Some mycosporine-like compounds were characterized in various parts of the pseudopodetion and may also be of interest to have a better understanding of the metabolic distribution in tripartite lichens.
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Submitted on : Monday, October 1, 2012 - 4:09:30 PM
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Friardi Ismed. Phytochimie de lichens du genre Stereocaulon : étude particulière de S. Halei Lamb et S. montagneanum Lamb, deux lichens recoltés en Indonésie. Sciences pharmaceutiques. Université Rennes 1, 2012. Français. ⟨NNT : 2012REN1S053⟩. ⟨tel-00737382⟩

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