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dc.contributor.authorZacaro, A. A.
dc.contributor.authorde Almeida, M. C.
dc.contributor.authorCella, D. M.
dc.identifier.citationCytogenetic and Genome Research. Basel: Karger, v. 103, n. 1-2, p. 185-191, 2003.
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. atolraria 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. Copyright (C) 2003 S. Karger AG, Baselen
dc.relation.ispartofCytogenetic and Genome Research
dc.sourceWeb of Science
dc.titleRecombination nodules in coleopteran species: Palembus dermestoides(Tenebrionidae) and Epicauta atomaria (Meloidae)en
dc.contributor.institutionUniversidade Federal de Viçosa (UFV)
dc.contributor.institutionUniv Estadual Ponta Grossa
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.description.affiliationUniv Fed Vicosa, UFV Dept Biol Geral, BR-36570000 Vicosa, MG, Brazil
dc.description.affiliationUniv Estadual Ponta Grossa, Ponta Grossa, Parana, Brazil
dc.description.affiliationUniv Estadual Paulista, Rio Claro, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Rio Claro, SP, Brazil
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