Abstract
The lignification process in mature Norway spruce [Picea abies (L.) H. Karsten] xylem cell walls was studied using transmission electron microscopy (TEM)–immunogold detection with a polyclonal antibody raised against a specific lignin substructure, dibenzodioxocin. The study reveals for the first time the exact location of this abundant eight-ring structure in the cell wall layers of wood. Spruce wood samples were collected in Southern Finland at the time of active growth and lignification of the xylem cell walls. In very young tracheids where secondary cell wall layers were not yet formed, the presence of the dibenzodioxocin structure could not be shown at all. During secondary cell wall thickening, the dibenzodioxocin structure was more abundant in the secondary cell wall layers than in the middle lamella. The highest number of gold particles revealing dibenzodioxocin was in the S2+S3 layer. Statistically significant differences were found in the frequency of gold particles present in various cell wall layers. For comparison, wood sections were also cut with a cryomicrotome for light and fluorescence microscopy.
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Abbreviations
- BSA:
-
bovine serum albumin
- ELISA:
-
enzyme linked immunosorbent assay
- KLH:
-
keyhole limpet hemocyanin
- TEM:
-
transmission electron microscopy
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Acknowledgements
This investigation was funded by the Academy of Finland (grant no: 43091) and the National Technology Agency TEKES under The Finnish Forest Cluster Research Program WOOD WISDOM. This work is a part of the Center of Excellence in Plant Biology and Forest Biotechnology (project no. 164346) as granted by the Academy of Finland and the Ministry of Education of Finland. Wood samples were prepared and electron micrographs taken at the Electron Microscopy Unit of the Institute of Biotechnology, University of Helsinki.
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Kukkola, E.M., Koutaniemi, S., Gustafsson, M. et al. Localization of dibenzodioxocin substructures in lignifying Norway spruce xylem by transmission electron microscopy–immunogold labeling. Planta 217, 229–237 (2003). https://doi.org/10.1007/s00425-003-0983-x
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DOI: https://doi.org/10.1007/s00425-003-0983-x