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Published on July 30, 2008; 10.1104/pp.108.123513

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Received May 25, 2008
Accepted July 22, 2008

Novel Rhamnogalacturonan I and Arabinoxylan Polysaccharides of Flax Seed Mucilage

Radnaa Naran , Guibing Chen , and Nicholas C. Carpita *

Department of Botany & Plant Pathology; Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907-2054

* Corresponding author; email: carpita{at}purdue.edu.

The viscous seed mucilage of flax (Linum usitatissimum) is a mixture of rhamnogalacturonan I and arabinoxylan with novel side-group substitutions. The rhamnogalacturonan I has numerous single non-reducing terminal residues of the rare sugar L-galactose attached at the O-3 positions of the rhamnosyl residues instead of the typical O-4 position. The arabinoxylan is highly branched primarily with double branches of non-reducing terminal L-arabinosyl units at the O-2 and O-3 positions along the xylan backbone. While a portion each polysaccharide can be purified by anion exchange chromatography, the side-group structures of both polysaccharides are modified further in about one-third of the mucilage to form composites with enhanced viscosity. Our finding of the unusual side-group structures for two well-known cell wall polysaccharides supports a hypothesis that plants make a selected few ubiquitous backbone polymers, onto which a broad spectrum of side-group substitutions are added to engender many possible functions. To this end, modification of one polymer may be accompanied by complementary modifications of others to impart functions to heterocomposites not present in either polymer alone.




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