Plant Physiol. Illumina
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PLANT PHYSIOLOGY , Vol 115, Issue 2 793-801, Copyright © 1997 by American Society of Plant Biologists

WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY

Two Rhamnogalacturonide Tetrasaccharides Isolated from Semi-Retted Flax Fibers Are Signaling Molecules in Rubus fruticosus L. Cells

E. Dinand, G. Excoffier, Y. Lienart and M. R. Vignon
Centre de Recherches sur les Macromolecules Vegetales-Centre National de la Recherche Scientifique, Associe a l'Universite Joseph Fourier, B.P. 53, 38041 Grenoble cedex 9, France

Water extraction of semi-retted flax (Linum usitatissimum L.) fiber bundles yielded a mixture of pectic oligosaccharides and two acidic rhamnogalacturonide tetrasaccharides that were separated by size-exclusion chromatography. One- and two-dimensional nuclear magnetic resonance studies and fast atom bombardment-mass spectrometry experiments indicated that the two tetrasaccharides have a common primary structure, i.e. [alpha]-D-[delta]GalpA(1[->2)-[alpha]-L-Rhap(1->4)-[alpha]-D-GalpA-(1 ->2)-L-[alpha],[beta]-Rha p, with a rhamnopyranose as terminal reducing end, and a 4-deoxy-[beta]-L-threo-hex-4-eno-pyranosiduronic acid at the nonreducing end. However, the two tetrasaccharides differ by an acetyl group located at the O-3 position of the internal galacturonic acid residue. These two tetrasaccharides induce the activation of D-glycohydrolases of Rubus fructicosus L. cells or protoplasts within minutes.




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Copyright © 1997 by the American Society of Plant Biologists