Summary
Microscopical examination of the xylem of straight Eucalyptus regnans trees of high growth stress revealed the presence of radial dislocations in the secondary wall of many of the fibres. These features were characterized by a localized disruption in the microfibrillar orientation of the cellulose and were evident in both unlignified and lignified cell walls. Dislocations were not detected in trees having low peripheral growth stress. The origin of these features was suggested to lie in the expansion of the cell wall during the relaxation of longitudinal growth stresses following removal of the sample from the tree. A similar origin of the typically convoluted form of the gelatinous layer of tension wood fibres is discussed.
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References
Boyd, J. D. 1950. Tree growth stresses: I. Growth stress evaluation. Aust. J. Sci. Res. B3: 270–293
Boyd, J. D. 1972. Tree growth stresses: Part V: Evidence of an origin in differentiation and lignification. Wood Sci. Technol. 6: 251–262
Mayor, H. D., Hampton, J. C., Rosario, B. 1961. A simple method for removing the resin from epoxy embedded tissue. J. Cell. Biol. 9: 909–910
Nicholson, J. E. 1971. A rapid method for estimating longitudinal growth stresses in logs. Wood Sci. Technol. 5: 40–48
Scurfield, G. 1973. Reaction wood: Its structure and function. Science 179: 647–655
Scurfield, G., Wardrop, A. B. 1962. The nature of reaction wood. VI. The reaction anatomy of seedlings of wood perennials. Aust. J. Bot. 10: 93–105
Wardrop, A. B. 1964. The reaction anatomy of arborescent angiosperms. In: Zimmermann, M. H. (Ed.): The formation of wood in forest trees. New York: Academic Press, 405–456
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The author expresses his appreciation to Dr. J. D. Boyd for helpful discussions.
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Chafe, S.C. Radial dislocations in the fibre wall of Eucalyptus regnans trees of high growth stress. Wood Sci. Technol. 11, 59–77 (1977). https://doi.org/10.1007/BF00353603
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DOI: https://doi.org/10.1007/BF00353603