Détermination de la signature moléculaire des conifères fossiles par la maturation artificielle de leurs homologues actuels : implications paléobotaniques et paléoenvironnementales

Abstract : Many biomolecules that constitute terrestrial vascular plants are only synthesized by a restricted number of plant taxa and have thus a chemotaxonomic specificity. Some of these biomolecules, like the terpenoids, are particularly resistant and can be preserved within sediments where they are transformed into geomolecules during diagenesis. Geoterpenoids keep, partially or totally, their initial specificity (palaeochemotaxonomic specificity). However, our current knowledge in botanical palaeochemotaxonomy, allowing to link these plant biomarkers to plant taxa, remains incomplete. The aim of this study is to determine the molecular signature of fossil conifers. In this objective, 68 species belonging to the 7 extant conifer families were subjected to artificial maturation by confined pyrolysis. This process converts the bioterpenoids included within the plant material into geoterpenoids. The results show that the "fossilized" Pinaceae, Araucariaceae, Cupressaceae, Sciadopityaceae, Podocarpaceae, Taxodiaceae and Taxaceae can distinguished from each other by the nature and the relative proportion of these geoterpenoids. The comparison of these molecular signatures allows to achieve intergeneric groups for each family. These groups are comparable to those of the phylogenetic classification. In the future, these results could be used for palaeobotanical, palaeoenvironmental, environmental and archaeological assessments
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Yueming Lu. Détermination de la signature moléculaire des conifères fossiles par la maturation artificielle de leurs homologues actuels : implications paléobotaniques et paléoenvironnementales. Paléontologie. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0353⟩. ⟨tel-01751660⟩

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