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.
Contemporary Papers| April 01 1965
TELOPHASE SEGREGATION OF CHROMOSOMES AND AMITOSIS
From the Laboratory of Plant Physiology, Jagellonian University, Cracow, Poland.
The author's present address is Department of Biology, University of Oregon, Eugene, Oregon
Received: March 03 1964
Online Issn: 1540-8140
Print Issn: 0021-9525
Copyright © 1965 by The Rockefeller Institute Press
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J. Molè-Bajer; TELOPHASE SEGREGATION OF CHROMOSOMES AND AMITOSIS . J Cell Biol 1 April 1965; 25 (1): 79–93. doi: https://doi.org/10.1083/jcb.25.1.79-a
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