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48. Triemer, R. E. and R. M. Brown, Jr.
1974. Cell division in Chlamydomonas moewusii. J. Phycol.
10:419-433.
48. Summary
Cell division in Chlamydomonas moewusii
is described. The cells become immobile with flagellar abscission
prior to mitosis. The basal bodies migrate toward the nucleus
and become intimately associated with the nuclear membrane which
is devoid of ribosomes where adjacent to the basal bodies. The
basal bodies replicate at preprophase. The nucleolus fragments
at this stage. By prophase the basal body pairs have migrated
to the nuclear poles. Spindle fibers become prominent in the
nucleus. The nuclear membrane does not fragment. The nucleus
assumes a crescent-form by metaphase. Polar fenestrae are absent.
Kinetochores appear at anaphase. An interzonal spindle elongates
as the chromosomes move to the nuclear poles. Daughter nuclei
become abscised by an ingrowth of nuclear membrane, leaving behind
a separated, degenerating interzonal spindle. Ribosomes reappear
on the outer nuclear membrane at late telophase. Nucleoli reform
early in cytokinesis. The cleavage furrow, associated microtubules,
and endoplasmic reticulum comprise the phycoplast. Cytokinesis
proceeds rapidly after the completion of telophase. The basal
body-nucleus relationship becomes reorganized into the typical
interphase condition late in cytokinesis. Specific and predictable
organelle rearrangements during mitosis have been described.
Cell division in C. moewusii is compared with other algae,
especially C. reinhardtii.
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Last modified 27 October 2005.
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