The nucleolar organizer of Plethodon cinereus cinereus (Green) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1973-12

AUTHORS

James Kezer, H. C. Macgregor

ABSTRACT

The lampbrush nucleolar organizers in P. c. cinereus are on the shorter arms of the 7th longest bivalent, near to the centromeres. The organizer consists of a non-chromomeric, Feulgen-negative section of the half bivalent axis inserted between typically chromomeric regions with normal lampbrush loops. The main axis of the organizer may appear double or single. The distributions and lengths of the double regions are variable. The axial strand of the organizer can be broken with DNase. Nucleolus-like objects are attached at irregular intervals along the organizer axis. The attached nucleoli closely resemble the free nucleoli in the same nucleus. Where free and attached nucleoli appear as beaded rings, the general characteristics and range of lengths of the attached rings are similar to those of the free rings. The attached rings occur singly, in pairs, or in clusters. The point of attachment of a ring is sometimes marked by a granule on the organizer axis. Pairs of attached nucleolar rings sometimes form double bridges in which the nucleoli extend linearly across a gap in the organizer axis. The length of the organizer varies from 20 μm to 300 μm, depending, at least in part, on the stage of oocyte development. The difference is a function of the length of the axial strand. Nucleolar organizers similar to that described for P. c. cinereus have been seen on the lampbrush bivalents of 7 other species of Plethodon and 2 species of Eurycea. In all of these, the 2 organizers of the nucleolus bivalents differ in length. More... »

PAGES

427-444

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00399410

DOI

http://dx.doi.org/10.1007/bf00399410

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037783087

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/4730560


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