The Ultrastructure of Differentiating and Mature Bordered Pit Membranes From Cypress (<i>Taxodium Distichum</i> L. Rich.)

Authors

  • R. J. Thomas

Abstract

The bordered pit membrane of cypress is characterized by a margo and torus composed of a dense network of microfibrils oriented in a predominately radial direction with amorphous materials deposited on the torus. Incomplete border pit aspiration often results, presumably because of the angular shape of the inner side of the pit aperture and the fact that the torus is only slightly larger than the aperture. Differentiating pit membranes are characterized by a decidedly thickened torus formed prior to secondary border formation. Removal of the matrix substance from the margo and thinning of the torus occur simultaneously. After matrix removal, the margo is perforated and the torus attains its mature dimension.

References

Côté, W. A. Jr., Z. Koran, and A. C. Day. 1964. Replica techniques for electron microscopy of wood and paper. Tappi 47(8): 477-484.nInternational Association Wood Anatomists. 1964. Multilingual glossary of terms used in wood anatomy.nLiese, W. 1965. The fine structure of bordered pits in softwoods, p. 271-290. In W. A. Côté, Jr. (ed.), Cellular ultrastructure of woody plants. Syracuse University Press, Syracuse, New York.nStamm, A. J. 1970. Maximum effective pit pore radii of the heartwood and sapwood of six softwoods as affected by drying and resoaking. Wood and Fiber 1(4): 263-269.nThomas, R. J., and D. D. Nicholas, 1966. Pit membrane structure in loblolly pine as influenced by solvent exchange drying. For. Prod. J. 16(3): 53-56.nThomas, R. J., and J. L. Scheld. 1967. The distribution and size of intertracheid pits in an eastern hemlock. For. Sci. 13(1): 85-89.nThomas, R. J. 1968. The development and ultra-structure of the bordered pit membrane in the southern yellow pines. Holzforschung 22(2): 37-44.nThomas, R. J. 1969. The ultrastructure of southern pine bordered pit membranes as revealed by specialized drying techniques. Wood and Fiber 1(12): 110-123.nThomas, R. J. 1970. Origin of bordered pit margo microfibrils. Wood and Fiber 2(3): 285-288.nThomas, R. J. 1972. Unpublished data.n

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Published

2007-06-05

Issue

Number 2 / Summer 1972

Section

Research Contributions

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