Summary
Microtubules have been shown to run around the perimeter of the pit aperture of developing bordered pits of Salix fragilis, L. These microtubules are parallel to the microfibrils being produced and do not converge with them. Although microtubules may be parallel to microfibrils in differentiating vessel elements as well as in fibres, many cases have been found where microtubules are not so orientated. There is no direct evidence for the involvement of microtubules in the orientation of microfibrils in the secondary wall, although their position during wall synthesis suggests some ancillary role.
Similar content being viewed by others
References
Cronshaw, J.: Cytoplasmic fine structure and cell wall development in differentiating xylem elements. In: Cellular ultrastructure of woody plants, ed. W. A. Côté, p. 99–124. Syracuse: Syracuse University Press 1965.
—: Tracheid differentiation in tobacco pith cultures. Planta (Berl.) 72, 78–90 (1967).
Ledbetter, M. C., and K. R. Porter: A “microtubule” in plant cell fine structure. J. Cell Biol. 19, 239–250 (1963).
Pickett-Heaps, J. D., and D. H. Northcote: Relationship of cellular organelles to the formation and development of the plant cell wall. J. exp. Bot. 17, 20–26 (1966a).
——: Organisation of microtubules and endoplasmic reticulum during mitosis and cytokinesis in wheat meristems. J. Cell Sci. 1, 109–120 (1966b).
——: Cell division in the formation of the stomatal complex of the young leaves of wheat. J. Cell Sci. 1, 121–128 (1966c).
Preston, R. D.: Structural and mechanical aspects of plant cell walls with particular reference to synthesis and growth. In: The formation of wood in forest trees, ed. M. H. Zimmermann, p. 169–188. New York: Academic Press 1964.
Robards, A. W., and P. G. Humpherson: Phytoferritin in plastids of the cambial zone of willow. Planta (Berl.) 76, 169–178 (1967).
Srivastava, L.: On the fine structure of the cambium of Fraxinus americana, L. J. Cell Biol. 31, 79–93 (1966).
—, and T. P. O'Brien: On the ultrastructure of the cambium and its vascular derivatives. I. Cambium of Pinus strobus, L. Protoplasma (Wien) 61, 257–276 (1966).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Robards, A.W., Humpherson, P.G. Microtubules and angiosperm bordered pit formation. Planta 77, 233–238 (1967). https://doi.org/10.1007/BF00385293
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00385293