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The Journal of Cell Biology, Vol 25, 79-93, Copyright © 1965 by Rockefeller University Press

CONTEMPORARY PAPERS

TELOPHASE SEGREGATION OF CHROMOSOMES AND AMITOSIS

J. Molè-Bajer D.Sc.1

1 From the Laboratory of Plant Physiology, Jagellonian University, Cracow, Poland.

The author's present address is Department of Biology, University of Oregon, Eugene, Oregon

Cases of "distributive c-mitosis" (the term does not mean that colchicine has been used) in plant endosperm are described, in which the chromosomes of metaphase type (two-chromatid chromosomes) are distributed at random because of phragmoplast activity in a process similar to non-disjunction. There is some evidence that chromosmal fibres can be formed within the phragmoplast under special circumstances; during "distributive c-mitosis" some kinetochores show active movements due to cooperation with chromosomal fibres formed in the phragmoplast; while other chromosomes, as indicated by their arrangements and shape, are moved without any activity of kinetochores. Some components of the phragmoplast have the fastest movements occurring in mitosis. Some cases are described in which the phragmoplast divides telophase and interphase nuclei into two or more groups and moves the pieces a considerable distance apart. In a similar way, the phragmoplast may divide newly formed restitution nuclei. This phenomenon leads to a reduction of chromosome numbers, and the course of the process itself is reminiscent of amitosis.

Submitted on March 3, 1964


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