UTL Repository >
ISA - Instituto Superior de Agronomia >
DBEB - Departamento de Botânica e Engenharia Biologica >
CBAA - Centro de Botânica aplicada à Agricultura >
CBAA - Artigos de Revista >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/3524

Title: Different numbers of rye B chromosomes induce identical compaction changes in distinct A chromosome domains
Authors: Delgado, M.
Caperta, A.
Ribeiro, T.
Viegas, W.
Jones, R.N.
Morais-Cecilio, L.
Keywords: B chromosome
DNA
rye
Issue Date: 2004
Publisher: Karger
Citation: "Cytogenetic and Genome Research". ISSN 1424-8581. 106 (2004) 320-324
Abstract: In rye each B chromosome (B) represents 5.5% of the diploid A genome. Rye Bs have several nuclear to whole plant effects although they seem to bear no genes except for the ones that lead to their maintenance within a population. In this context, and considering that rye Bs are enriched in repetitive non-coding regions that build up heterochromatin (het), we investigated the influence of Bs on the organization of two chromatin fractions, namely the ribosomal DNA (facultative het) and satellite (non-het) domain of rye chromosome 1 by silver staining on root tip metaphase cells. The results show that rye Bs cause condensation both in the NOR and in the chromosome 1 satellite domain. Since the silver staining technique used is indicative of the transcriptional activity of the NORs, the condensation observed at those loci demonstrates that the rRNA gene arrays are down-regulated in the presence of Bs, regardless of their number per individual. Furthermore, the organizational changes of metaphase NORs find parallel with the interphase organization of ribosomal chromatin, since the frequency of cells with intranucleolar condensed rDNA regions increases drastically and nuclear matrix attachment pattern is altered in the presence of the Bs. Our results show an identical effect of the Bs on the organization of two distinct chromosome domains displaying a presence/absence dichotomy
Peer Reviewed: yes
URI: http://hdl.handle.net/10400.5/3524
ISSN: 1424-8581
Appears in Collections:CBAA - Artigos de Revista

Files in This Item:

File Description SizeFormat
REP-Caperta-2004 Delgado et al B induce differential compaction-1.pdf196.18 kBAdobe PDFView/Open
Statistics
FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpaceOrkut
Formato BibTex mendeley Endnote Logotipo do DeGóis 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 
Estamos no RCAAP Governo Português separator Ministério da Educação e Ciência   Fundação para a Ciência e a Tecnologia

Financiado por:

POS_C UE