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Journal of Cell Science, Vol 4, 3-15, Copyright © 1969 by Company of Biologists

Submitted on August 19, 1967
Revised on June 5, 1968

Some Observations on the Nucleolus in Spirogyra

E. G. JORDAN 1 and M. B. E. GODWARD 2

1 Department of Botany, Queen Mary College, Mile End Road, London, E. 1, England; Department of Biology, Queen Elizabeth College, Campden Hill, London, W. 8.
2 Department of Botany, Queen Mary College, Mile End Road, London, E. 1, England

Several species of Spirogyra have been collected and fixed for electron microscopy in either 2% osmium tetroxide or 5% glutaraldehyde. Mitotic cells were selected with the light microscope from filaments of Spirogyra embedded in Epon.

Evidence is given for an interphase cycle in the nucleolus of Spirogyra. A clear association between nucleolar material and chromosomes occurs at mitosis. The breakdown of the nucleolus is shown to occur in two stages, one as a consequence of the withdrawal of the nucleolar chromosomes, and the other after telophase in the new nucleus. The significance of these findings is discussed.

Submitted on August 19, 1967
Revised on June 5, 1968






© The Company of Biologists Ltd 1969