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AOBPreview published online on August 25, 2006
Annals of Botany, doi:10.1093/aob/mcl183
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© The Author 2006. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received March 17, 2006
Revised June 14, 2006
Accepted July 5, 2006

Article

The Micromorphology of Pit Membranes in Tracheary Elements of Ericales: New Records of Tori or Pseudo-tori?

DAVID RABAEY 1, FREDERIC LENS 2, ERIK SMETS 2, and STEVEN JANSEN 3 *

1 Laboratory of Plant Systematics, K.U.Leuven, Institute of Botany and Microbiology, Kasteelpark Arenberg 31, B-3001 Heverlee, Belgium
2 Laboratory of Plant Systematics, K.U.Leuven, Institute of Botany and Microbiology, Kasteelpark Arenberg 31, B-3001 Heverlee, Belgium; National Herbarium of the Netherlands, Leiden University Branch, PO Box 9514, NL-2300 RA Leiden, The Netherlands
3 Laboratory of Plant Systematics, K.U.Leuven, Institute of Botany and Microbiology, Kasteelpark Arenberg 31, B-3001 Heverlee, Belgium; Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3DS, UK

* To whom correspondence should be addressed.
STEVEN JANSEN, E-mail: s.jansen{at}rbgkew.org.uk


  Abstract

• Background and Aims Intervascular pit membranes were examined within Ericales to determine the distribution and structure of torus-like thickenings.

• Methods Forty-nine species representing 12 families of the order Ericales were investigated using light, scanning and transmission electron microscopy. They were compared with four species of Oleaceae to determine the true nature of the thickenings.

• Key Results Pit membranes with torus-like thickenings were observed in seven species of Ericaceae and were found to be amorphous, plasmodesmata-associated structures with an irregular distribution. These pseudo-tori show major differences compared with true tori with respect to their distribution and ultrastructure. Genuine tori, which are strongly correlated with round pit apertures in narrow tracheary elements, were found in two species of Osmanthus (Oleaceae).

• Conclusions The pseudo-tori found in some Ericaceae are considered to be similar to pit membrane thickenings previously recorded in Rosaceae. While true tori appear to be functionally significant in terms of efficiency and safety of water transport, the possible function of pseudo-tori could be associated with the role of plasmodesmata during differentiation of tracheids, fibre-tracheids or narrow vessels.

Keywords: Ericaceae, Ericales, Oleaceae, pit membrane, plasmodesmata, pseudo-torus, torus, tracheary elements.
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S. Jansen, Y. Sano, B. Choat, D. Rabaey, F. Lens, and R. R. Dute
Pit membranes in tracheary elements of Rosaceae and related families: new records of tori and pseudotori
Am. J. Botany, April 1, 2007; 94(4): 503 - 514.
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