beta-1,3-Glucan in Developing Cotton Fibers: Structure, Localization, and Relationship of Synthesis to That of Secondary Wall Cellulose.

Plant Physiology
D MaltbyD P Delmer

Abstract

Evidence is presented for the existence of a noncellulosic beta-1,3-glucan in cotton fibers. The glucan can be isolated as distinct fractions of varying solubility. When fibers are homogenized rigorously in aqueous buffer, part of the total beta-1,3-glucan is found as a soluble polymer in homogenates freed of cell walls. The proportion of total beta-1,3-glucan which is found as the soluble polymer varies somewhat as a function of fiber age. The insoluble fraction of the beta-1,3-glucan remains associated with the cell wall fraction. Of this cell wall beta-1,3-glucan, a variable portion can be solubilized by treatment of walls with hot water, a further portion can be solubilized by alkaline extraction of the walls, and 17 to 29% of the glucan remains associated with cellulose even after alkaline extraction. A portion of this glucan can also be removed from the cell walls of intact cotton fibers by digestion with an endo-beta-1,3-glucanase. The glucan fraction which can be isolated as a soluble polymer in homogenates freed of cell walls is not associated with membranous material, and we propose that it represents glucan which is also extracellular but not tightly associated with the cell wall. Enzyme digestion studies indicate th...Continue Reading

References

Mar 15, 1978·European Journal of Biochemistry·H E HoppR Pont Lezica
Dec 1, 1969·Analytical Biochemistry·D M Updegraff
Oct 1, 1977·Plant Physiology·D J NevinsW H Loescher

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Citations

Jun 1, 1993·The Plant Journal : for Cell and Molecular Biology·A AndrawisD P Delmer
May 1, 1985·Plant Physiology·Y Kato, D J Nevins
Feb 1, 1997·Current Biology : CB·S Cutler, C Somerville
Dec 25, 2004·Plant Physiology·Elodie Parre, Anja Geitmann

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