Summary
When Sitka spruce (Picea sitchensis) is stored in water, an increase takes place in the permeability of the wood. This increase is due to bacterial degradation of the tori and bordered pit membranes and partial degradation of the crossfield pits. It has been demonstrated that two bacteria—Bacillus subtilis and Flavobacterium pectinovorum—isolated from this water stored wood, grow and produce amylase, xylanase and pectinase in sapwood blocks suspended in sterile pond water. Since these organisms have also been shown to increase the permeability of sapwood blocks, it has been concluded that they are primarily responsible for the permeability changes that occur when spruce poles are stored in lake water.
When the two organisms are incubated together in sapwood blocks, growth of F. pectinovorum is synergistically affected, while growth of B. subtilis is antagonised. However, no antagonism of enzyme production was evident. The levels of biological activity in the sapwood in these laboratory experiments were much higher than the values observed in the natural lake system. The concentration effect obtained in the laboratory system, in contrast to the dilution effect occurring in the lake environment, is undoubtedly responsible for this variance. Results indicate that the rate at which permeability changes occur could possibly be accelerated by replacing the natural lake system with an enclosed tank system.
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Fogarty, W.M., Ward, O.P. Growth and enzyme production by Bacillus subtilis and Flavobacterium pectinovorum in Picea sitchensis . Wood Science and Technology 7, 261–270 (1973). https://doi.org/10.1007/BF00351072
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DOI: https://doi.org/10.1007/BF00351072