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Ultrastructural Observations Reveal the Presence of Channels between Cork Cells

Published online by Cambridge University Press:  08 October 2009

Rita Teresa Teixeira*
Affiliation:
Centro de Estudos Florestais, Instituto superior de Agronomia, Universidade Técnica de Lisboa1349-017, Portugal
Helena Pereira
Affiliation:
Centro de Estudos Florestais, Instituto superior de Agronomia, Universidade Técnica de Lisboa1349-017, Portugal
*
Corresponding author. E-mail: [email protected]
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Abstract

The ultrastructure of phellem cells of Quercus suber L. (cork oak) and Calotropis procera (Ait) R. Br. were analyzed using electron transmission microscopy to determine the presence or absence of plasmodesmata (PD). Different types of Q. suber cork samples were studied: one year shoots; virgin cork (first periderm), reproduction cork (traumatic periderm), and wet cork. The channel structures of PD were found in all the samples crossing adjacent cell walls through the suberin layer of the secondary wall. Calotropis phellem also showed PD crossing the cell walls of adjacent cells but in fewer numbers compared to Q. suber. In one year stems of cork oak, it was possible to follow the physiologically active PD with ribosomic accumulation next to the aperture of the channel seen in the phellogen cells to the completely obstructed channels in the dead cells that characterize the phellem tissue.

Type
Biological Science Applications
Copyright
Copyright © Microscopy Society of America 2009

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References

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