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On the polarity of cellulose in the cell wall of Valonia
Junji Sugiyama, Henri Chanzy and Jean François Revol
Vol. 193, No. 2 (1994), pp. 260-265
Published by: Springer
Stable URL: http://www.jstor.org/stable/23383101
Page Count: 6
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The orientation of the triclinic phase of cellulose in the cell wall of Valonia ventricosa J. Agardh was investigated by X-ray- and electron-diffraction analysis. In addition to the well-documented uniplanar-axial organization of the cell wall which requires that the a* axis should be always perpendicular to the wall surface, the direction of this axis was also found to be pointing outward from the plasma membrane side of the wall. This unidirectionality was persistent throughout the various layers that constitute the cell wall and also for the three microfibrillar orientations that occur in Valonia cell walls. The unidirectionality of the a* axis indicates, in particular, that the Valonia cellulose microfibrils are not twisted along their axis. These observations are consistent with a cellulose biosynthetic scheme where a close association exists between terminal-complex orientations and those of the cellulose microfibrils. In this context, the unidirectionality of the a* axis of cellulose seems to be related to the restricted mobility of the terminal complexes which are able to slide in the plasma membrane but not to rotate along their long axis.
Planta © 1994 Springer