Artículo
Fossil cutin of Johnstonia coriacea (Corystospermaceae, Upper Triassic, Cacheuta, Argentina)
Fecha de publicación:
03/2018
Editorial:
Elsevier Science
Revista:
International Journal Of Coal Geology
ISSN:
0166-5162
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
For the first time, a cutin polymer was obtained from specimens of Johnstonia coriacea (Corystospermales, Corystospermaceae) from the Upper Triassic of Cacheuta, Argentina. These are preserved as fossilized cuticles i.e., naturally macerated compressions under anoxic conditions. Laboratory oxidation reactions were used to obtain the cuticle, which after additional, long-term oxidation yielded the cutin polymer. Cutin, cuticles, and fossilized cuticles, were analyzed by semi-quantitative Fourier transform infrared (FTIR) spectroscopy. Cutin IR spectrum was mainly characterized by intense peaks of aliphatic stretching bands at 3000–2600 cm−1, ester C=O groups centered at 1730–1715 cm−1, and aromatic C=C absorption bands at 1645–1640 cm−1. Values of semi-quantitative, IR-derived ratios of cutin were lower than those of the cuticle. The only exception was the notably higher C=O/C=C ratio found in cutin, which is supportive of the presence of ester C=O groups. CHal/C=O value (0.8) of J. coriacea compares with those recorded for Lycopersicon esculentum (0.8; extant) and Macroneuropteris sheuchzeri (0.9; Pennsylvanian), which indicates a similar cross-linking degree of the monomers characterizing the cutin of both extant and fossil taxa.
Palabras clave:
ARGENTINA
,
CORYSTOSPERMACEAE
,
CUTICLE
,
CUTIN
,
TRIASSIC
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IANIGLA)
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Citación
D`angelo, José Alejandro; Zodrow, Erwin L.; Fossil cutin of Johnstonia coriacea (Corystospermaceae, Upper Triassic, Cacheuta, Argentina); Elsevier Science; International Journal Of Coal Geology; 189; 3-2018; 70-74
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