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Suberized Cell Walls of Cork from Cork Oak Differ from Other Species

Published online by Cambridge University Press:  31 August 2010

Rita Teresa Teixeira  and
Helena Pereira
Rita Teresa Teixeira*
Affiliation:
Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade Técnica de Lisboa, 1349-017, Portugal
Helena Pereira
Affiliation:
Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade Técnica de Lisboa, 1349-017, Portugal
*
Corresponding author. E-mail: [email protected]
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Abstract

Plants have suberized cells that act as protective interfaces with the environment or between different plant tissues. A lamellar structure of alternating dark and light bands has been found upon transmission electron microscopy (TEM) observation of cork cells and considered a typical feature of the suberized secondary wall. We observed cork cells from periderms of Quercus suber, Quercus cerris, Solanum tuberosum, and Calotropis procera by TEM after uranyl acetate and lead citrate staining. A lamellated structure was observed in S. tuberosum and C. procera but not in Q. suber and Q. cerris where the suberized cell wall showed a predominantly hyaline aspect with only a dark dotted staining. Removal of suberin from Q. suber cells left a thinner secondary wall that lost the translucent aspect. We hypothesize that the species' specific chemical composition of suberin will result in different three-dimensional macromolecular development and in a different spatial location of lignin and other aromatics. A lamellated ultrastructure is therefore not a general feature of suberized cells.

Keywords

Quercus subercell wallcorklamellaesuberinultrastructure
Type
Biological Applications
Information
Microscopy and Microanalysis , Volume 16 , Issue 5 , October 2010 , pp. 569 - 575
Copyright
Copyright © Microscopy Society of America 2010

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