Planta

, Volume 90, Issue 2, pp 174–190 | Cite as

Some ultrastructural features of Volvox, with particular reference to the phenomenon of inversion

  • J. D. Pickett-Heaps
Article

Summary

Some features of the ultrastructure of Volvox are described. Golgi bodies were often associated with the endoplasmic reticulum (ER), and the two basal bodies appeared to be accompanied by two probasal bodies. A few vegetative cells were binucleate. All cells examined had a peripheral cytoskeleton of microtubules which was particularly well developed in the cells of sperm packets. During inversion of a colony, the cells elongated considerably, possibly due to the increased length of these peripheral microtubules; the cell profile also became some-what narrowed at the inner edge of the flexing colony. Cytoplasmic connections were large and numerous in young coenobia, but were generally absent in older vegetative colonies; by inversion, they had become confined to the chloroplast end of the cells where they seemed to act as hinges. Elements of the ER ran through these interconnections, possibly providing an intercellular communication network needed for the coordinated activity of inversion. A new structural feature was discovered in the form of circular (or possibly spiral) striations on the plasmalemma around these cytoplasmic connections. They were detectable just before inversion, and were most pronounced immediately after.

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References

  1. Berkaloff, C.: Observations sur l'organisation infrastructurale d'une Volvocale. C.R. Acad. Sci. (Paris) 262, 1232–1234 (1966).Google Scholar
  2. Bisalputra, T., Stein, J. R.: The development of cytoplasmic bridges in Volvox aureus. Canad. J. Bot. 44, 1697–1702 (1966).Google Scholar
  3. Darden, W. H.: Sexual differentiation in Volvox aureus. J. Protozool. 13, 239–255 (1966).Google Scholar
  4. Deason, T. R., Darden, W. H., Ely, S.: The development of sperm packets of the M5 strain of Volvox aureus. J. Ultrastruct. Res. 26, 85–94 (1969).Google Scholar
  5. Fritsch, F. E.: Structure and reproduction of the algae, vol. 1. Cambridge: Univ. Press 1935.Google Scholar
  6. Ikushima, N., Maruyama, S.: The protoplasmic connection in Volvox J. Protozool. 15, 136–140 (1968).Google Scholar
  7. Johnson, U. G., Porter, K. R.: Fine structure of cell division in Chlamydomonas reinhardi. J. Cell Biol. 38, 403–425 (1968).Google Scholar
  8. Kochert, G.: Differentiation of reproductive cells in Volvox carteri. J. Protozool. 15, 438–452 (1968).Google Scholar
  9. Lang, N. J.: Electron microscopy of the Volvocaceae and Astrephomenaceae. Amer. J. Bot. 50, 280–300 (1963).Google Scholar
  10. Pickett-Heaps, J. D.: The effects of colchicine on the ultrastructure of dividing plant cells, xylem wall differentiation and distribution of cytoplasmic microtubules. Develop. Biol. 15, 206–236 (1967).Google Scholar
  11. —: Microtubule-like structures in the plastids of chloroplasts of two algae. Planta (Berl.) 81, 193–200 (1968a).Google Scholar
  12. —: Ultrastructure and differentiation in Chara. IV. Spermatogenesis. Aust. J. biol. Sci. 21, 255–274 (1968b).Google Scholar
  13. — Fowke, L. C.: Cell division in Oedogonium. I. Aust. J. biol. Sci. 22, 857–894 (1969).Google Scholar
  14. Pickett-Heaps, J. D. Fowke, L. C.: Cell division in Oedogonium. III. Golgi bodies, and wall structure and formation. Aust. J. biol. Sci. 23, in press (1970).Google Scholar
  15. Porter, K. R.: Cytoplasmic microtubules and their function. In: Principles of biomolecular organization. (Ciba Found. Symp.; C. E. W. Wolstenholme and M. O'Connor, eds.), p. 308–345. London: Churchill 1966.Google Scholar
  16. Ringo, D. L.: Flagellar motion and fine structure of the flagellar apparatus in Chlamydomonas. J. Cell Biol. 33, 543–571 (1967).Google Scholar

Copyright information

© Springer-Verlag 1970

Authors and Affiliations

  • J. D. Pickett-Heaps
    • 1
  1. 1.Research School of Biological SciencesAustralian National UniversityCanberra

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