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http://cicy.repositorioinstitucional.mx/jspui/handle/1003/1556| Structural characterization of lignin in four cacti wood: Implications of lignification in the growth form and succulence | |
| Jorge Reyes Rivera Ramón Marcos Soto Hernández GONZALO CANCHE ESCAMILLA Teresa Terrazas | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| 10.3389/fpls.2018.01518 | |
| CACTACEAE DIMORPHIC WOOD EVOLUTIONARY-ADAPTIVE PROCESSES S-RICH LIGNIN STRUCTURAL PROTECTION SUCCULENCE | |
| 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. | |
| 2018 | |
| Artículo | |
| Frontiers in plant science, 9, 1518, https://doi.org/10.3389/fpls.2018.01518. | |
| Inglés | |
| Reyes-Rivera, J., Soto Hernandez, M., Canché-Escamilla, G., & 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. | |
| BIOLOGÍA Y QUÍMICA | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | Artículos de Investigación Arbitrados |
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