Conversion of guaiacyl to syringyl moieties on the cinnamyl alcohol pathway during the biosynthesis of lignin in angiosperms

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Abstract
Aglycons derived from 4-O-β-D-glucosides of both caffeyl and 5-hydroxyconiferyl alcohols were incorporated into guaiacyl (G) and syringyl (S) units in the lignin of newly formed xylem of several angiosperms. It is likely that these aglycons enter the cinnamyl alcohol pathway as intermediates in the introduction of methoxyl groups onto aromatic rings, and serve as precursors for the biosynthesis of lignin. The S/G ratio in this pathway was coincident with the ratio in the cell wall lignin of each tree. Our results indicate that the cinnamyl alcohol pathway involves the same mechanisms as the cinnamic acid and cinnamyl CoA pathways and they suggest that this novel pathway might be part of a metabolic grid in the biosynthesis of lignin.

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