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Comparative analysis of leaf cell-wall polysaccharides of Dialypetalanthus fuscescens and Bathysa meridionalis: evidence of biochemical similarities between Dialypetalanthaceae and Rubiaceae-Cinchonoideae

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Author(s): MORAES FABIO | HAHN MICHAEL G. | BRAGA MARCIA R.

Journal: Revista Brasileira de Botânica
ISSN 0100-8404

Volume: 24;
Issue: 3;
Start page: 289;
Date: 2001;
Original page

Keywords: Dialypetalanthaceae | Amazonian tree | Bathysa meridionalis | Rubiaceae | Cinchonoideae | cell-wall polysaccharides

ABSTRACT
Dialypetalanthus fuscescens is an Amazonian endemic species with problematic taxonomic position. This neotropical rainforest tree belongs to the monospecific Dialypetalanthaceae. In the present work, we analysed the leaf cell-wall polysaccharide composition of Dialypetalanthus fuscescens and compared it to that of Bathysa meridionalis (Rubiaceae-Cinchonoideae). Glycosyl composition and glycosyl-linkage analysis indicated that both species have similar cell wall composition. Arabinogalactans were the major component of the pectic polysaccharides and xylans, although being reported in minor amounts in dicots, were found to be the predominant hemicellulosic polysaccharide in cell walls of both species. These findings are in agreement with previous data on cell wall composition reported for Rubiaceae and corroborate the current suggestion of the possible link between this family and Dialypetalanthaceae.
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