ISSN:
1432-0878
Keywords:
Tetrasporogenesis
;
Rhodophyta
;
Corallina
;
Nuclei
;
Endoplasmic reticulum
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary Post-meiotic tetraspore mother cells of Corallina officinalis L. have been studied by light and electron microscopy. During the course of post-meiotic cellular reorganisation each nucleus becomes surrounded by a complex of precisely oriented endoplasmic reticulum, termed nuclear endoplasmic reticulum. A distinctive feature of this relationship is an electron dense substance in contact with the nuclear surface and extending as groundplasm between the ER cisternae as far as the outer limits of the complex, where it gives place to the ribosome-containing matrix of the general cytoplasm. There is circumstantial evidence to indicate that the extracisternal electron dense material is a product of nucleo-cytoplasmic interaction, and that it is involved in the assembly of ribosomes. The nuclear endoplasmic reticulum appears to be active in the production of smaller swollen cisternal elements, which form frequently anastomosing reticular tracts in the regions between adjacent nuclei. There is structural evidence of vesicular transport of material from the swollen cisternae to the proximal (“forming”) face of the Golgi apparatus. These events are thought to be of fundamental importance in achieving the cellular reorganisation and transformation which occurs after the second meiotic division.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00306600
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