Abstract
Lignins are cell wall heteropolymers that arise from the peroxidase-mediated coupling of p-coumaryl, coniferyl and sinapyl alcohols. In gymnosperms, they are derived from coniferyl alcohol, whereas in angiosperms, lignins are derived from coniferyl and sinapyl alcohols. Thus, although it is frequently assumed that the chemical complexity of lignins has increased during plant evolution, it is frequently forgotten that pteridophytes have lignins that are derived from sinapyl alcohol. Until recently, most peroxidases characterized in flowering plants only oxidized coniferyl alcohol. However, recent reports have described the molecular characterization of peroxidases capable of oxidizing sinapyl alcohol (syringyl peroxidases). Current molecular studies propose that the structural motifs of syringyl peroxidases predate the radiation of tracheophytes, which suggests that syringyl peroxidases existed before the appearance of syringyl lignins.
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