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Cell-Wall Polysaccharides of Developing Flax Plants.

T. A. Gorshkova1, S. E. Wyatt, V. V. Salnikov

  • 1Laboratory of Cell Wall Biochemistry, Institute of Biology, Russian Academy of Sciences, Kazan 420503, Russia (T.A.G., V.V.S., M.R.I., V.V.L.).

Plant Physiology
|March 1, 1996
PubMed
Summary

Flax fibers have unique cell wall polysaccharides with a low degree of branching. These structural characteristics are consistent across different flax tissues, offering insights into plant cell wall development.

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Materials Science

Background:

  • Flax (Linum usitatissimum L.) fibers are crucial bast fibers derived from protophloem procambial cells.
  • These fibers develop within cortical bundles surrounding the vascular cylinder, contributing to the plant's structural integrity.

Purpose of the Study:

  • To elucidate the polysaccharide composition of cell walls in various developing flax plant organs.
  • To analyze the cell wall composition of fiber-rich stem peels and xylem tissues.
  • To compare the polysaccharide structure and branching patterns in flax with other plant species.

Main Methods:

  • Extraction and characterization of ammonium oxalate-soluble and buffer-soluble polysaccharides from different flax tissues.
  • Analysis of cell wall components, including arabinans, rhamnogalacturonans, polygalacturonic acid, galactans, xyloglucans, xylans, and glucomannans.

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  • Quantification of cellulose and other polysaccharides in xylem cells.

    • Main Results:

    • All flax tissues contained 5-linked arabinans, rhamnogalacturonans, and polygalacturonic acid.
    • Fiber-rich peels showed significant amounts of a branched 4-linked galactan.
    • Cross-linking glycans included (fucogalacto)xyloglucan, xylans, and (galacto)glucomannans, with primary cell walls having more xyloglucan.
    • Xylem cells were primarily composed of 4-xylans (60%) and cellulose (32%).
    • Flax noncellulosic polysaccharides exhibited an unusually low degree of branching compared to other plants.

    Conclusions:

    • The polysaccharide composition of flax cell walls varies among different cell types.
    • Key structural features, such as linkage structure and degree of branching of certain noncellulosic polysaccharides, remain invariant across flax tissues.
    • The unique cell wall composition of flax may contribute to its fiber properties.