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| Titel |
Determination of the molecular signature of fossil conifers by experimental palaeochemotaxonomy – Part 1: The Araucariaceae family |
| VerfasserIn |
Y. Lu, Y. Hautevelle, R. Michels |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 3 ; Nr. 10, no. 3 (2013-03-20), S.1943-1962 |
| Datensatznummer |
250018165
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| Publikation (Nr.) |
 copernicus.org/bg-10-1943-2013.pdf |
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| Zusammenfassung |
| Twelve species of the conifer family Araucariaceae, including
Araucaria (6 species), Agathis (3 species) and Wollemia (1 species) genera, were submitted to
artificial maturation by confined pyrolysis. The aim of these experiments is
to transform the biomolecules synthesized by these species into their
homologous geomolecules in laboratory conditions. Determination of the
diagenetic molecular signatures of Araucariaceae through experimentation on
extant representatives allows us to complete our knowledge in botanical
palaeochemotaxonomy. Such knowledge is relevant to palaeoenvironmental,
environmental and archaeology purposes. All artificially diagenetic species
of Araucariaceae are firstly characterized by a predominance of saturated
tetracyclic diterpenoids including ent-beyerane, phyllocladanes and
ent-kauranes. Moreover, Araucaria genus shows a high relative abundance of bicyclic
sesquiterpenoids, particularly the cadalane-type compounds accompanied by
those of eudesmane and bisabolane types as well as chamazulene and
pentamethyl-dihydroindenes. Diterpenoids are of labdane, isopimarane and
abietane types (essentially derived from abietanoic acids) as well as
isohexyl alkylaromatic hydrocarbons. Compared to the tetracyclic
diterpenoids, these compounds show a relatively lower abundance, reaching
trace levels in the case of saturated abietanes. Distributions of
sesquiterpenoids and diterpenoids of Agathis show some similarities to that of Araucaria, with the exception
of one species, in which the tetracyclic compounds are absent and the
abietane type (essentially derived from abietanoic acids) predominant. High
similarities between the Wollemia and Araucaria genera are observed. Both are characterized
by some high relative abundance of tetracyclic compounds with no
predominance of other specific diterpenoids. |
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