Summary
This paper deals with the fine structure of the fibrillar centres of the nucleolus inAllium cepa cells in ultrathin, sections of in vivo fixed roots. The ultrastructural observations have allowed us to consider each nucleolar fibrillar centre as an active zone in the nucleolar chromatin loop, and to propose a possible model for the organization of the different components of the nucleolus within it.
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Acknowledgments. The author wishes to thank Dr.M. C. Risueño for her valuable comments and discussion. This work has been partially supported by the III Plan de Desarrollo of Spain and by a grant of the Foundation Rodriguez Pascual.
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Moreno Díaz de la Espina, S. Ultrastructural aspects of nucleolar fibrillar centres in meristematic cells ofAllium cepa. Experientia 32, 1384–1387 (1976). https://doi.org/10.1007/BF01937389
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DOI: https://doi.org/10.1007/BF01937389