The grass Colpodium versicolor (Stev.) Schmalh is one of six angiosperms with extremely reduced chromosome set 2n=2x=4. The chromosome complement of this species was studied. The DNA methylation pattern was determined with a specific monoclonal antiboby. 5-Methylcytosine residues are present in different chromosomal sites, with specific occurrence, some methylated bands showing differences between homologous chromosomes. Moreover, a fluorescent in situ hybridisation with telomere repeats and 45S rDNA sequences were performed. Hybridisation signals of telomeric repeats are detectable at the distal ends of the two pair of chromosomes, while 45S rDNA is localised in one chromosomal site, corresponding to the secondary constriction. In addition, 45S rDNA, as well as telomere-associated sequences, results to be 5-methylcytosineenriched. The results are discussed and compared with those previously obtained in other plant systems 2n=4 with the aim to enable a better knowledge of the lengthwise differentiation of this chromosome complement.

Methylated-rich regions and tandem repeat arrays along the chromosome complement of Colpodium versicolor (Stev.) Schmalh

RUFFINI CASTIGLIONE, MONICA
;
CREMONINI, ROBERTO
2009

Abstract

The grass Colpodium versicolor (Stev.) Schmalh is one of six angiosperms with extremely reduced chromosome set 2n=2x=4. The chromosome complement of this species was studied. The DNA methylation pattern was determined with a specific monoclonal antiboby. 5-Methylcytosine residues are present in different chromosomal sites, with specific occurrence, some methylated bands showing differences between homologous chromosomes. Moreover, a fluorescent in situ hybridisation with telomere repeats and 45S rDNA sequences were performed. Hybridisation signals of telomeric repeats are detectable at the distal ends of the two pair of chromosomes, while 45S rDNA is localised in one chromosomal site, corresponding to the secondary constriction. In addition, 45S rDNA, as well as telomere-associated sequences, results to be 5-methylcytosineenriched. The results are discussed and compared with those previously obtained in other plant systems 2n=4 with the aim to enable a better knowledge of the lengthwise differentiation of this chromosome complement.
RUFFINI CASTIGLIONE, Monica; Kotseruba, V; Cremonini, Roberto
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/201433
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 7
social impact