Spindle microtubule dynamics following ultraviolet-microbeam irradiations of mitotic diatoms
Lesions (''ARBs'') generated in metaphase and anaphase central spindles of Hantzschia by an ultraviolet microbeam are devoid of microtubules previously present. In vivo, the poleward transverse edge of the lesion invariably loses birefringence poleward, until this segment has vanished; the loss is slow during metaphase and faster at anaphase. The other transverse edge, proximal to the overlap, remains stable until disassembly of the whole spindle. We conclude that the central spindle microtubules are not in flux during metaphase to telophase, and that depolymerization of these microtubules takes place only from the end distal to the pole, as during normal spindle disassembly. Microtubule polarity and the creation of free ends may determine which microtubules are disassembled during later mitosis and how disassembly proceeds.
- Research Organization:
- Biology Department, University of Oregon, Eugene, OR
- OSTI ID:
- 7133640
- Journal Information:
- Cell; (United States), Journal Name: Cell; (United States) Vol. 36:3; ISSN CELLB
- Country of Publication:
- United States
- Language:
- English
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALGAE
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
CELL DIVISION
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
MICROSCOPY
MITOSIS
PLANTS
RADIATION EFFECTS
RADIATIONS
ULTRAVIOLET RADIATION