Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 52, Issue 25, Pages 7651-7659Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf0491198
Keywords
monolignol biosynthesis; monolignol glucoside; coniferaldehyde; tracer experiments; lignin; Magnolia kobus; Nerium indicum
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To examine the behavior of cinnamaldehyde and cinnamyl alcohol glucosides in lignifying tissues. angiosperms were subjected to tracer experiments using radioisotope-labeled and stable isotope-labeled glucosides. The aglycone from coniferaldehyde glucoside was efficiently incorporated into guaiacyl and syringyl lignin as a cinnamyl alcohol unit. The aglycone from coniferin was also incorporated into guaiacyl and syringyl lignin. However, some of the coniferin-derived aglycone that was incorporated into lignin passed through a cinnamaldehyde form prior to dehydrogenative polymerization. When coniferin was administered together with coniferaldehyde glucoside, syringyl units were rarely synthesized from coniferin via the cinnamyl alcohol stage, whereas numerous sydnol units were synthesized from coniferaldehyde glucoside. These observations suggest that the coniferaldehyde form is crucial for the biosynthesis of syringyl lignin in angiosperms.
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