Plant Physiol. Illumina
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Xyloglucan Octasaccharide XXLGol Derived from the Seeds of Hymenaea courbaril Acts as a Signaling Molecule1

Carem Vargas-Rechia2, Fany Reicher, Maria Rita Sierakowski, Alain Heyraud, Hugues Driguez, and Yvette Liénart*

Department of Biochemistry, Universidad Federal do Paranã, BP 19046, 81531-970, Curitiba, Paranã, Brazil (F.R.); Department of Chemistry, Universidad Federal do Paranã, BP 19081, 81531-990, Curitiba, Paranã, Brazil (M.R.S.); and Centre de Recherches sur les Macromolécules Végétales-Centre National de la Recherche Scientifique, BP 53, 38041 Grenoble cedex 9, France (affiliated with the Joseph Fourier University, Grenoble; C.V.-R., A.H., H.D., Y.L.)

Treatment of the xyloglucan isolated from the seeds of Hymenaea courbaril with Humicola insolens endo-1,4-beta -d-glucanase I produced xyloglucan oligosaccharides, which were then isolated and characterized. The two most abundant compounds were the heptasaccharide (XXXG) and the octasaccharide (XXLG), which were examined by reference to the biological activity of other structurally related xyloglucan compounds. The reduced oligomer (XXLGol) was shown to promote growth of wheat (Triticum aestivum) coleoptiles independently of the presence of 2,4-dichlorophenoxyacetic acid (2,4-D). In the presence of 2,4-D, XXLGol at nanomolar concentrations increased the auxin-induced response. It was found that XXLGol is a signaling molecule, since it has the ability to induce, at nanomolar concentrations, a rapid increase in an alpha -l-fucosidase response in suspended cells or protoplasts of Rubus fruticosus L. and to modulate 2,4-D or gibberellic acid-induced alpha -l-fucosidase.

1   Financial support was provided by Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brazil).
2   Permanent address: Department of Chemistry and Physical, Faculdade de Ciêncas Farmacêuticas de Ribeirão Preto-Universidade de São Paulo, 14040-903, Ribeirão Preto, São Paolo, Brazil.
*   Corresponding author; e-mail liénart{at}cermav.cnrs.fr; fax 33-4-76-54-72-03.

Plant Physiol. (1998) 116: 1013-1021
Copyright Clearance Center:   0032-0889/98/116/1013/09
© 1998 American Society of Plant Physiologists




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