Investigations of the ultrastructure of some stages in the biodegradation in nature of the woody tissue of Pinus nigra Arn. subsp. laricio (Poir.) Maire

Kilbertus, G.; Rohr, R.; Mangenot, F.

Holzforschung 30(5): 156-164

1976


ISSN/ISBN: 0018-3830
Accession: 000414359

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Abstract
Electron microscope studies were made on sound samples of Pinus nigra wood and on branches which had fallen from trees and had attained various stages of decay. Three stages of degradation were recognised: separation of the different layers of the cell wall, formation of cavities in the cell wall due to fungal activity, and progressive delignification of xylem fibres. The fungus advances from cell to cell through pits or parallel to the middle lamella. The final stages of fungal attack are characterised by an increase in the number of bacteria, and the presence of green algae was noted. The part played by insects in the progress of degradation is discussed. Electron micrographs are reproduced with English captions. Degradation occurred in 3 stages: separation of the layers of the cell wall, formation of cavities through the action of fungi and progressive delignification of the xylem fibres. The fungi pass from cell to cell through the pits or spread parallel to the central lamella. There is a large increase in the number of bacteria in the later stages. Degradation occurred in 3 stages - separation of the layers of the cell wall, cavity formation due to fungal activity and further delignification of xylem fibres. The fungi grew from cell to cell through the pit or parallel to the central lamella. A considerable increase in the number of bacteria occurred in the last stages of fungal attack.