Distribution of 45S and 5S rDNA sites in 23 species of Eleocharis (Cyperaceae)

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dc.contributor.authorMaximiano da Silva, Carlos Roberto [UNESP]
dc.contributor.authorQuintas, Carolina Cristina
dc.contributor.authorLaforga Vanzela, Andre Luis
dc.contributor.institutionUniversidade Estadual de Londrina (UEL)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:31:01Z
dc.date.available2014-05-20T15:31:01Z
dc.date.issued2010-10-01
dc.description.abstractStudies of rDNA location in holocentric chromosomes of the Cyperaceae are scarce, but a few reports have indicated the occurrence of multiple 45S rDNA sites at terminal positions, and in the decondensed state of these regions in prometaphase/metaphase. To extend our knowledge of the number 45S and 5S rDNA sites and distribution in holocentric chromosomes of the Cyperaceae, 23 Brazilian species of Eleocharis were studied. FISH showed 45S rDNA signals always located in terminal regions, which varied from two (E. bonariensis with 2n = 20) to ten (E. flavescens with 2n = 10 and E. laeviglumis with 2n = 60). 5S rDNA showed less variation, with 16 species exhibiting two sites and 7 species four sites, preferentially at terminal positions, except for four species (E. subarticulata, E. flavescens, E. sellowiana and E. geniculata) that showed interstitial sites. The results are discussed in order to understand the predominance of terminal rDNA sites, the mechanisms involved in the interstitial positioning of 5S rDNA sites in some species, and the events of amplification and dispersion of 45S rDNA terminal sites.en
dc.description.affiliationUniversidade Estadual de Londrina (UEL), CCB, Dept Biol Geral, Lab Biodiversidade & Restauracao Ecossistemas, BR-86051970 Londrina, PR, Brazil
dc.description.affiliationUNESP, Inst Biociencias Letras & Ciencias Exatas, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Biociencias Letras & Ciencias Exatas, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.sponsorshipFundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná (FAADCT/PR)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent951-957
dc.identifierhttp://dx.doi.org/10.1007/s10709-010-9477-5
dc.identifier.citationGenetica. Dordrecht: Springer, v. 138, n. 9-10, p. 951-957, 2010.
dc.identifier.doi10.1007/s10709-010-9477-5
dc.identifier.issn0016-6707
dc.identifier.urihttp://hdl.handle.net/11449/40274
dc.identifier.wosWOS:000282432000005
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofGenetica
dc.relation.ispartofjcr1.366
dc.relation.ispartofsjr0,649
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectFISHen
dc.subjectHolocentric chromosomesen
dc.subjectrDNA distributionen
dc.subjectDNA amplificationen
dc.titleDistribution of 45S and 5S rDNA sites in 23 species of Eleocharis (Cyperaceae)en
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
unesp.author.orcid0000-0002-2442-2211[3]

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