ON THE BEHAVIOR OF MONOLIGNOL GLUCOSIDES IN LIGNIN BIOSYNTHESIS .3. SYNTHESIS OF VARIOUSLY LABELED CONIFERIN AND INCORPORATION OF THE LABELINTO SYRINGIN IN THE SHOOT OF MAGNOLIA-KOBUS
N. Matsui et al., ON THE BEHAVIOR OF MONOLIGNOL GLUCOSIDES IN LIGNIN BIOSYNTHESIS .3. SYNTHESIS OF VARIOUSLY LABELED CONIFERIN AND INCORPORATION OF THE LABELINTO SYRINGIN IN THE SHOOT OF MAGNOLIA-KOBUS, Holzforschung, 50(5), 1996, pp. 408-412
To examine the possible in vivo conversion of coniferin to syringin in
the biosynthetic pathway oi lignin, variously radio-labeled coniferin
was fed to a shoot of Magnolia kobus. When coniferin-[side chain gamm
a-H-3, Glc-U-C-14] was administered, only H-3-activity was detected in
syringin isolated from the shoot. The lack of C-14-activity In isolat
ed syringin suggests that the conversion from guaiacyl to syringyl pro
ceeded at the stage of monolignols, and the glucose moiety is temporal
ly removed during the process of methoxylation. These results suggest
the possible role of monolignols in the control of monomer composition
of lignin.