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vol.23 issue4Changes in the floristic and structure of a dry deciduous forest during a period of 4-years (1994-1998), southeastern BrazilFloral biology of Unonopsis guatterioides (A. DC.) R.E. Fr. an Annonaceae pollinated by Euglossini author indexsubject indexarticles search
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Brazilian Journal of Botany

Print version ISSN 0100-8404On-line version ISSN 1806-9959


TINE, MARCO AURÉLIO SILVA; CORTELAZZO, ANGELO  and  BUCKERIDGE, MARCOS S.. Occurrence of xyloglucan containing protuberances in the storage cell walls of cotyledons of Hymenaea courbaril L.. Rev. bras. Bot. [online]. 2000, vol.23, n.4, pp.415-419. ISSN 0100-8404.

Despite the suggestions of its pectic composition, no clear evidence for this has been presented. Here we show the occurrence of such a structure in walls of cells from cotyledons of Hymenaea courbariI L. These cells are known to accumulate large amounts of storage xyloglucan in the wall and, in this case, the protuberances seem to contain this storage polysaccharide rather than pectin. A hypothetical sequence of events leading from wall strands to protuberances was assembled based on scanning electron microscopy observations. On this basis, a tentative model for how polysaccharides are distributed into the wall, near the regions where protuberances are found, is proposed to explain the presence of storage xyloglucan in their composition.

Keywords : Xyloglucan; pectin; cell wall; protuberances; Hymenaea courbaril.

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