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AOBPreview published online on December 14, 2005
Annals of Botany, doi:10.1093/aob/mcj030
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© The Author 2005. 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 July 29, 2005
Revised October 6, 2005
Accepted October 27, 2005

Article

Topochemical Studies on Modified Lignin Distribution in the Xylem of Poplar (Populus spp.) after Wounding

C. FRANKENSTEIN 1 *, U. SCHMITT 2, and G. KOCH 2

1 University of Hamburg, Department of Wood Science, Division Wood Biology, Leuschnerstrasse 91, 21031 Hamburg, Germany
2 Federal Research Centre for Forestry and Forest Products, Institute for Wood Biology and Wood Protection, Leuschnerstrasse 91, 21031 Hamburg, Germany

* To whom correspondence should be addressed.
C. FRANKENSTEIN, E-mail: c.frankenstein{at}holz.uni-hamburg.de


  Abstract

• Background and Aims Information on the influence of wounding on lignin synthesis and distribution in differentiating xylem tissue is still scarce. The present paper provides information on cell modifications with regard to wall ultrastructure and lignin distribution on cellular and subcellular levels in poplar after wounding.

• Methods Xylem of Populus spp. close to a wound was collected and processed for light microscopy, transmission electron microscopy and cellular UV microspectrophotometry. Cell wall modification with respect to lignin distribution was examined at different stages of wound tissue development. Scanning UV microspectrophotometry and point measurements were used to determine the lignin distribution.

• Key Results Xylem fibres within a transition zone between differentiated xylem laid down prior to wounding and the tissues formed after wounding developed distinctively thickened secondary cell walls. Those modified walls and cell corners showed, on average, a higher lignin content and an inhomogeneous lignin distribution within the individual wall layers.

• Conclusions The work presented shows that wounding of the xylem may induce a modified wall architecture and lignin distribution in tissues differentiating at the time of wounding. An increasing lignin content and distinctively thickened walls can contribute to improved resistance as part of the compartmentalization process.

Keywords: Wound reaction, fibre cell wall, UV microspectrophotometry, lignin distribution, Populus spp.
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