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Determination of the Molecular Signature of Fossil Conifers by Experimental Palaeochemotaxonomy - Part 1: the Araucariaceae Family Y

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Determination of the Molecular Signature of Fossil Conifers by Experimental Palaeochemotaxonomy - Part 1: the Araucariaceae Family Y Determination of the molecular signature of fossil conifers by experimental palaeochemotaxonomy - Part 1: The Araucariaceae family Y. Lu, Y. Hautevelle, R. Michels To cite this version: Y. Lu, Y. Hautevelle, R. Michels. Determination of the molecular signature of fossil conifers by experimental palaeochemotaxonomy - Part 1: The Araucariaceae family. Biogeosciences, European Geosciences Union, 2013, 10 (3), pp.1943-1962. 10.5194/bg-10-1943-2013. hal-01303028 HAL Id: hal-01303028 https://hal.archives-ouvertes.fr/hal-01303028 Submitted on 8 Dec 2016 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. EGU Journal Logos (RGB) Open Access Open Access Open Access Advances in Annales Nonlinear Processes Geosciences Geophysicae in Geophysics Open Access Open Access Natural Hazards Natural Hazards and Earth System and Earth System Sciences Sciences Discussions Open Access Open Access Atmospheric Atmospheric Chemistry Chemistry and Physics and Physics Discussions Open Access Open Access Atmospheric Atmospheric Measurement Measurement Techniques Techniques Discussions Open Access Biogeosciences, 10, 1943–1962, 2013 Open Access www.biogeosciences.net/10/1943/2013/ Biogeosciences doi:10.5194/bg-10-1943-2013 Biogeosciences Discussions © Author(s) 2013. CC Attribution 3.0 License. Open Access Open Access Climate Climate of the Past of the Past Determination of the molecular signature of fossil conifers by Discussions Open Access experimental palaeochemotaxonomy – Part 1: The Araucariaceae Open Access Earth System family Earth System Dynamics Dynamics Y. Lu, Y. Hautevelle, and R. Michels Discussions UMR 7359 CNRS Georessources, University of Lorraine, BP 239, 54506 Vandœuvre-les-Nancy` cedex, France Open Access Geoscientific Geoscientific Open Access Correspondence to: Y. Hautevelle ([email protected]) Instrumentation Instrumentation Received: 11 July 2012 – Published in Biogeosciences Discuss.: 8 August 2012 Methods and Methods and Revised: 7 January 2013 – Accepted: 17 February 2013 – Published: 20 March 2013 Data Systems Data Systems Discussions Open Access Open Access Abstract. Twelve species of the conifer family Araucari- 1 Introduction Geoscientific aceae, including Araucaria (6 species), Agathis (3 species) Geoscientific Model Development and Wollemia (1 species) genera, were submitted to artifi- Numerous studiesModel of the molecularDevelopment composition of extant ter- cial maturation by confined pyrolysis. The aim of these ex- restrial plants have pointed out the chemotaxonomic values Discussions periments is to transform the biomolecules synthesized by of many biological compounds, bioterpenoids in particular Open Access these species into their homologous geomolecules in labo- (e.g. Aplin et al., 1963; Smith, 1976; CastroOpen Access et al., 1996; ratory conditions. Determination of the diagenetic molecu- Mongrand et al., 2001).Hydrology This means that and these biomolecules Hydrology and lar signatures of Araucariaceae through experimentation on are synthesized by a restrictedEarth number System of plant taxa and can Earth System extant representatives allows us to complete our knowledge be used as specific markers. While most bioterpenoids are in botanical palaeochemotaxonomy. Such knowledge is rele- degraded and their atomic constituentsSciences recycled in the sur- Sciences vant to palaeoenvironmental, environmental and archaeology face processes of Earth, a minor part is incorporated into Discussions Open Access purposes. All artificially diagenetic species of Araucariaceae sediments, thus joining the geological cycle.Open Access During this are firstly characterized by a predominance of saturated tetra- process, the bioterpenoids are transformed by diagenesis, Ocean Science cyclic diterpenoids including ent-beyerane, phyllocladanes leading to the formationOcean of reaction Science products called geoter- and ent-kauranes. Moreover, Araucaria genus shows a high penoids. Their initial chemotaxonomic value can be partially Discussions relative abundance of bicyclic sesquiterpenoids, particularly or totally retained (e.g. Simoneit, 1986; Otto and Simoneit, the cadalane-type compounds accompanied by those of eu- 2001). Geoterpenoids of ancient sediments may thus provide Open Access desmane and bisabolane types as well as chamazulene and palaeochemotaxonomic information inherited fromOpen Access their bi- pentamethyl-dihydroindenes. Diterpenoids are of labdane, ological precursors. Solid Earth isopimarane and abietane types (essentially derived from abi- Botanical palaeochemotaxonomySolid Earth has some specific at- etanoic acids) as well as isohexyl alkylaromatic hydrocar- tributes compared to palaeobotany and palynology in the Discussions bons. Compared to the tetracyclic diterpenoids, these com- reconstruction of palaeofloral and palaeoclimatic evolutions pounds show a relatively lower abundance, reaching trace through geological times (e.g. Vliex et al., 1994; van Aarssen levels in the case of saturated abietanes. Distributions of et al., 2000; Hautevelle et al., 2006a). Indeed,Open Access (1) plant Open Access sesquiterpenoids and diterpenoids of Agathis show some biomarkers are more widespread in the stratigraphic record The Cryosphere similarities to that of Araucaria, with the exception of one than well-preserved plantThe macrofossils; Cryosphere (2) on the contrary to Discussions species, in which the tetracyclic compounds are absent and Palaeozoic and Mesozoic palynomorphs, they can be directly the abietane type (essentially derived from abietanoic acids) linked to specific taxa of plants, and (3) biomarkers could be predominant. High similarities between the Wollemia and readily analysed by usual organic geochemistry procedures Araucaria genera are observed. Both are characterized by on total rock samples. some high relative abundance of tetracyclic compounds with In addition to being useful to palaeofloristic and palaeocli- no predominance of other specific diterpenoids. matic studies, botanical palaeochemotaxonomy has also been recently applied in other instances. In environmental science, Published by Copernicus Publications on behalf of the European Geosciences Union. 1944 Y. Lu et al.: Determination of the molecular signature of fossil conifers it proved to be helpful in the appreciation of past land use Pinaceae and recent anthropogenic impacts to soil (e.g, Farella et al., 2001; Heim et al., 2010; Huang et al., 2011; Lavrieux et al., Podocarpaceae 2011) as well as in tracing river pollution caused by paper Pinophyta mills (e.g. Leeming and Nichols, 1998; Wang at al., 2007). (Conifer) Araucariaceae In archaeology, palaeochemotaxonomy is used to trace di- etary habits and to understand the use of natural products in Sciadopityaceae craft and funeral rites (e.g. Colombini et al., 2005; Romanus et al., 2008). Taxaceae Most of palaeochemotaxonomic investigations are de- rived from published chemotaxonomic data (Otto and Wilde, Taxodiaceae 2001) and to some parts from the studies of fossil plants found in sedimentary rocks (Otto and Simoneit, 2001; Otto Cupressaceae et al., 2005; Dutta et al., 2011). Unfortunately, our knowl- Fig. 1. Phylogenetic classification of conifers. edge on botanical palaeochemotaxonomy is still very scarce. As pointed out by Hautevelle et al. (2006b), difficulties are related to the following: (1) available chemotaxonomic data 2.1 Taxonomy, geographical distribution and living (generally focused on specific biomolecules or on particu- environments lar substances, like resins or essential oils); (2) degradation and diagenetic reactions, which may significantly modify the 2.1.1 Extant Araucariaceae initial molecular fingerprint, making it difficult to perform a direct chemotaxonomic relationship between an extant plant Today, Araucariaceae species represent a dominant com- and its fossil counterpart; (3) the scarcity of reference collec- ponent of Southern Hemisphere forests. The major native tions of well-preserved and identifiable fossil plants contain- Araucariaceae species are restricted to the South American, ing organic molecules. South-West Asian and the Western Pacific regions and cover In order to fill these gaps, within the 7 extant conifer fam- a large rainfall region extending from subtropics to tropics ilies (Fig. 1), we investigated the palaeochemotaxonomy of (Enright and Hill, 1995). Nowadays, more than 40 species several extant species of the Araucariaceae (Table 1) using an are described and consist of three well-defined genera, which experimental method based on artificial maturation by con- are (1) Agathis (Salisbury, 1807), represented by 21 species, fined pyrolysis (Hautevelle et al., 2006b). This procedure al- (2) Araucaria (Jussieu, 1978) represented by 19 species and lows simulation of the conversion of biomolecules into their (3) Wollemia (Jones et al., 1995) represented by the single corresponding diagenetic geomolecules (Stankiewicz et al., species Wollemia nobilis. The latter, previously thought to 2000; Gupta et al., 2006, 2007). Aims of this study are (1) to be extinct, was rediscovered
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