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Dynamics of the nuclear envelope during cell cycle in plants
Cytobios
|January 1, 1979
Summary
Nuclear envelope growth in onion root cells occurs mainly after mitosis, while nuclear pores form gradually during interphase. New nuclear envelopes may initially lack pores, which appear later in the cell cycle.
Area of Science:
- Cell Biology
- Plant Science
- Molecular Biology
Background:
- The nuclear envelope and nuclear pores are crucial for cell function.
- Understanding their dynamic changes during the cell cycle is essential.
Purpose of the Study:
- To investigate the growth patterns of the nuclear envelope.
- To determine the timing of nuclear pore formation during the cell cycle.
Main Methods:
- Stereology was used to analyze Allium cepa root meristem cells.
- Caffeine inhibition of cytokinesis created a binucleate cell population for synchronized analysis.
Main Results:
- Nuclear envelope growth is most prominent from mid G2 to mid G1.
- The number of nuclear pores doubles from mid G1 to mid G2.
- Nuclear pore formation rate is higher in early interphase (G1 to S).
Conclusions:
- Nuclear envelope expansion is linked to the reformation of nuclei post-mitosis.
- Newly formed nuclear envelopes may initially be anucleated, with pores developing subsequently.