Título
Structural characterization of lignin in four cacti wood: Implications of lignification in the growth form and succulence
Autor
Jorge Reyes Rivera
Ramón Marcos Soto Hernández
GONZALO CANCHE ESCAMILLA
Teresa Terrazas
Nivel de Acceso
Acceso Abierto
Referencia de datos
datasetDOI/10.3389/fpls.2018.01518
Materias
Resumen o descripción
Wood lignin composition strongly depends on anatomical features and it has been used as a marker for characterizing major plant groups. Wood heterogeneity in Cactaceae is involved in evolutionary and adaptive processes within this group; moreover, it is highly correlated to the species growth form. Here we studied the lignin structure from different types of woods in four Cactaceae species with different stem morphologies (Pereskia lychnidiflora, tree/fibrous wood; Opuntia streptacantha and Pilosocereus chrysacanthus, tree/succulent fibrous wood; Ferocactus hamatacanthus, cylindrical stem/dimorphic wood) in order to determine their relationship with the wood anatomy in an evolutionary-adaptive context. Dioxane lignin was isolated and analyzed by pyrolysis coupled with gas chromatography and mass spectrometry (Py-GC/MS), two-dimensional nuclear magnetic resonance spectroscopy (2D-NMR) and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The main linkages are the β-O−4′ ether (67–85%), the β-β′ resinol (10–26%) and the β-5′ and α-O−4′ linkages of the phenylcoumaran structures (≤7%). Spirodienone structures have a considerable abundance (5%) in the dimorphic wood of F. hamatacanthus. In addition, low contents (≤3%) of α,β-diaryl ether, α-oxidized β-O−4′ ether and dibenzodioxocin structures were found. The sinapyl- and coniferyl acetates are not part of the wood lignin in any of the studied species. The low (≤5%) γ-acetylation in the F. hamatacanthus and P. chrysacanthus wood lignin is here interpreted as an evidence of a high specialization of the wood elements in the conduction/storage of water. The lignin of the studied Cactaceae is composed predominantly of guaiacyl and syringyl units (S/G: 0.9–16.4). High abundance of syringyl units (62–94%) in three of the four species is considered as a defense mechanism against oxidative agents, it is a very conspicuous trait in the most succulent species with dimorphic wood. Furthermore, it is also associated with ferulates and the herein called γ-acetylated guaiacyl-syringaresinol complexes acting as nucleation sites for lignification and as cross-links between lignin and carbohydrates at the wide-band tracheid-fiber junctions.
Fecha de publicación
2018
Tipo de publicación
Artículo
Versión de la publicación
Versión publicada
Recurso de información
Formato
application/pdf
Fuente
Frontiers in plant science, 9, 1518, https://doi.org/10.3389/fpls.2018.01518.
Idioma
Inglés
Relación
&
Terrazas, T. (2018). Structural Characterization of Lignin in Four Cacti Wood: Implications of Lignification in the Growth Form and Succulence. Frontiers in plant science, 9, 1518, https://doi.org/10.3389/fpls.2018.01518.
Sugerencia de citación
Reyes-Rivera, J., Soto Hernandez, M., Canché-Escamilla, G.,
Repositorio Orígen
Repositorio Institucional CICY
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