caa a22 4500 463247698 CHVBK 20180405153330.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10086-006-0867-3 doi (NATIONALLICENCE)springer-10.1007/s10086-006-0867-3 The monomer composition controls the Σ β-O -4/Σ O -4 end monomer ratio of the linear lignin fraction [Elektronische Daten] [Laura Gómez Ros, José Espiñeira, Federico Pomar, Fuencisla Merino, Juan Cuello, Alfonso Ros Barceló] Lignins are cell wall phenolic heteropolymers that result from the oxidative coupling of three monolignols bearing p-coumaryl (H), coniferyl (G), and sinapyl (S) units, in a reaction mediated by peroxidases. Here, we report the existence of a relationship between the Σβ-O-4/ΣO-4 end monomer ratio of the linear lignin fraction, released through the specific cleavage of the alkyl ether linkages by thioacidolysis, and the G/S ratio of lignins, when this was estimated in differentially evolved vascular land plants. Most importantly, in the case of angiosperms, Gnetales, and lycopods, the Σβ-O-4/ΣO-4 end monomer ratio was apparently predictable from the proportions at which the G and S units were mixed. In the case of G lignins (present in basal gymnosperms and ferns), the Σβ-O-4/ΣO-4 end monomer ratio decayed exponentially to increase the O-4-linked dihydroconiferyl alcohol (DHCA) content. The results obtained suggest that the Σβ-O-4/ΣO-4 end monomer ratio of the linear lignin fraction depends intimately on the lignin monomer composition, and, therefore, on the chemical nature of the radicals derived from three monolignols (coniferyl, dihydroconiferyl, and sinapyl alcohols), whose gain have been finely tuned during land plant evolution. The Japan Wood Research Society, 2007 β-O -4 Lineal fraction nationallicence DHCA nationallicence Lignin nationallicence Σ β-O -4/Σ O -4 End monomer ratio nationallicence Syringyl moieties nationallicence Gómez Ros Laura Department of Plant Biology, University of Murcia, E-30100, Murcia, Spain aut Espiñeira José Department of Plant Biology, University of La Coruña, E-15071, La Coruña, Spain aut Pomar Federico Centro de Investigaciones Agrarias de Mabegondo, Apartado de Correos 10, E-15080, La Coruña, Spain aut Merino Fuencisla Department of Plant Biology, University of La Coruña, E-15071, La Coruña, Spain aut Cuello Juan Department of Plant Biology, University of Murcia, E-30100, Murcia, Spain aut Ros Barceló Alfonso Department of Plant Biology, University of Murcia, E-30100, Murcia, Spain aut Journal of Wood Science Springer-Verlag 53/4(2007-08-01), 314-319 1435-0211 53:4<314 2007 53 10086 https://doi.org/10.1007/s10086-006-0867-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10086-006-0867-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gómez Ros Laura Department of Plant Biology, University of Murcia, E-30100, Murcia, Spain aut NATIONALLICENCE 700 1- Espiñeira José Department of Plant Biology, University of La Coruña, E-15071, La Coruña, Spain aut NATIONALLICENCE 700 1- Pomar Federico Centro de Investigaciones Agrarias de Mabegondo, Apartado de Correos 10, E-15080, La Coruña, Spain aut NATIONALLICENCE 700 1- Merino Fuencisla Department of Plant Biology, University of La Coruña, E-15071, La Coruña, Spain aut NATIONALLICENCE 700 1- Cuello Juan Department of Plant Biology, University of Murcia, E-30100, Murcia, Spain aut NATIONALLICENCE 700 1- Ros Barceló Alfonso Department of Plant Biology, University of Murcia, E-30100, Murcia, Spain aut NATIONALLICENCE 773 0- Journal of Wood Science Springer-Verlag 53/4(2007-08-01), 314-319 1435-0211 53:4<314 2007 53 10086 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer