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A Cross-Polarization, Magic-Angle-Spinning, 13C-Nuclear-Magnetic-Resonance Study of Polysaccharides in Sugar Beet Cell Walls1

Catherine M.G.C. Renard2, * and Michael C. Jarvis

Chemistry Department, University of Glasgow, Glasgow G12 8QQ, Scotland

Solid-state nuclear magnetic resonance relaxation experiments were used to study the rigidity and spatial proximity of polymers in sugar beet (Beta vulgaris) cell walls. Proton T1rho decay and cross-polarization patterns were consistent with the presence of rigid, crystalline cellulose microfibrils with a diameter of approximately 3 nm, mobile pectic galacturonans, and highly mobile arabinans. A direct-polarization, magic-angle-spinning spectrum recorded under conditions adapted to mobile polymers showed only the arabinans, which had a conformation similar to that of beet arabinans in solution. These cell walls contained very small amounts of hemicellulosic polymers such as xyloglucan, xylan, and mannan, and no arabinan or galacturonan fraction closely associated with cellulose microfibrils, as would be expected of hemicelluloses. Cellulose microfibrils in the beet cell walls were stable in the absence of any polysaccharide coating.

1   This work was supported by a grant from the Institut National de la Recherche Agronomique (to C.M.G.C.R.) and by an Engineering and Physical Sciences Research Council award.
2   Present address: Station de Recherches Cidricoles, Biotranformation des Fruits et Légumes, Institut National de la Recherche Agronomique, BP 29, 35650 Le Rheu, France.
*   Corresponding author; e-mail catherine.renard{at}rennes.inra.fr; fax 33-2-99-28-52-10.

Plant Physiol. (1999) 119: 1315-1322
Copyright Clearance Center:   0032-0889/99/119//08
© 1999 American Society of Plant Physiologists




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