Summary
When the red-light grown protonema ofAdiantum capillus-veneris was transferred to the dark, the nucleus ceased its migration ca. 5 hours before cell plate formation (Mineyuki andFuruya 1980). To see whether the nucleus was held by some cytoplasmic structure during nuclear positioning, protonemata were treated with various centrifugal forces at different stages of the cell cycle. Nuclei of G1 phase were easily displaced by centrifugation at 360×g for 15 minutes, but those of G2 or M phase were not displaced by it, suggesting that the nuclei were held by some cytoplasmic elements in G2 or M phase. This nuclear anchoring was not detectable in protonemata that were treated with 5mM colchicine. With this treatment, the nucleus did not stop its migration at late G2 and moved even in prophase. And the retardation of organelle movement which was observed in cytoplasm on the lateral side of the nucleus after the cessation of premitotic nuclear migration (Mineyuki andFuruya 1984) was not observed in the presence of colchicine. Thus the nuclei appear to be held by colchicine-sensitive structure in cytoplasm between the lateral surface of the nucleus and cell wall during the premitotic nuclear positioning. Electron micrographs showing cytoplasmic microtubules were consistent with the idea.
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Abbreviations
- PPN:
-
Premitotic positioning of the nucleus
- L region:
-
Cytoplasm between the lateral surface of the nucleus and cell wall (seeMineyuki et al. 1984)
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Mineyuki, Y., Furuya, M. Involvement of colchicine-sensitive cytoplasmic element in premitotic nuclear positioning ofAdiantum protonemata. Protoplasma 130, 83–90 (1986). https://doi.org/10.1007/BF01276589
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DOI: https://doi.org/10.1007/BF01276589