Use este identificador para citar ou linkar para este item:
Registro completo de metadados
Campo DCValorIdioma
dc.contributor.authorZacaro, A.A.
dc.contributor.authorAlmeida, M.C. de
dc.contributor.authorCella, D.M.
dc.description.abstractThis work describes the first report about the occurrence of recombination nodules (RNs) in spread pachytene cells of two species of Coleoptera: Palembus dermestoides (Tenebrionidae) and Epicauta atomaria (Meloidae). The RNs were observed in preparations contrasted with phosphotungstic acid. Considering RN morphology and its occurrence in pachytene bivalents (one per autosome bivalent) these structures were interpreted to be late RNs. P. dermestoides and E. atomaria have 2n = 20 chromosomes including an Xyp sex determination system. In spite of most frequently subtelocentric morphology observed in the autosomes of both species, the occurrence of RNs is limited only to the synaptonemal complex (SC) structure of the long arms. These findings are in agreement with those obtained using light microscopy analysis in which only one chiasma or terminalization event is observed per autosomal bivalent in early or late metaphase I cells. The RNs have the same average width of the SC of each analyzed species, a circular shape, strong electron density, and are observed mainly between the lateral elements of the SC. The RNs of P. dermestoides and E. atomaria have approximately the same average size (width), 180 ± 20 nm and 160 ± 80 nm, respectively. The absence of RNs in the short arms and its occurrence in the long arms are discussed considering the short arm pericentromeric and pro-centric heterochromatin.en
dc.publisherCytogenetic and Genome Researchpt-BR
dc.relation.ispartofseriesv. 103, n. 01-02, p. 185–191, 2003pt-BR
dc.rightsKarger AG, Baselpt-BR
dc.subjectColeopteran speciespt-BR
dc.subjectPalembus dermestoidespt-BR
dc.subjectEpicauta atomariapt-BR
dc.titleRecombination nodules in coleopteran species: Palembus dermestoides (Tenebrionidae) and Epicauta atomaria (Meloidae)en
Aparece nas coleções:Artigos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
  Until 2100-12-31
texto completo194,91 kBAdobe PDFVisualizar/Abrir    Solictar uma cópia

Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.