Summary
Hypoxia disturbs the nucleolar cycle inAllium cepa L. meristems by diminishing the disorganizing stage and increasing the nucleologenesis time.
Though nucleolar remnants persist in the enlarged metaphase recorded under hypoxia, prenucleolar bodies appear at the same time than in control meristems if related to the timing of nucleolar envelope breakage. Such appearance is apparently independent of the chromosome condensation cycle, since it took place in anaphase and not in midtelophase as in controls.
Finally, the involvement of NORs in segregation is questioned since prenucleolar bodies are also segregated under hypoxia, both when integrated in the reforming nuclei or when dispersed in cytoplasm.
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Giménez-Abián, M.I., Rufas, J.S. & de la Torre, C. The plant nucleolar cycle under hypoxia. Protoplasma 126, 47–53 (1985). https://doi.org/10.1007/BF01287672
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DOI: https://doi.org/10.1007/BF01287672