Research Article

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Ag-NORs; Capra hircus; Chromosomal banding; Karyotype

In order to provide the first cytogenetic data of naturalized and threatened goat breeds from northeastern Brazil, cytogenetic analyses were carried out in individuals of Repartida and Moxotó breeds raised in Bahia and Ceará States. Males and females of both breeds had 2n = 60, with 29 autosomal acrocentric pairs plus the sex chromosome pair. The number of nucleolar organizer region (NOR ... more

R.P. Santos; P.R.A.M. Affonso; D. Diniz; A.S. Medrado; K.M. Silva; P.L.S. Carneiro
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Aegilops biuncialis; C-banding; chromosome; Fluorescence in situ hybridization; Karyotype

Aegilops biuncialis can be hybridized with wheat (Triticum spp) and has been used for wheat breeding and genetic studies. The A. biuncialis karyotype (Ub Ub Mb Mb) was investigated based on three A. biuncialis accessions grown in China. Two pairs of SAT chromosomes were identified as 1Ub and 5Ub ... more

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C-banding; cytotaxonomy; Triatominae

Cytogenetic analyses of triatomines are considered to be important taxonomic tools. Thus, we analyzed the pattern of constitutive heterochromatin in 7 species of triatomine with fragmentation of the sex chromosome X, focusing on the cytotaxonomy of these triatomines. The species analyzed included Triatoma vitticeps, Triatoma melanocephala, Triatoma tibiamaculata ... more

A.L. Guerra; K.C.C. Alevi; J.A. Rosa; M.T.V. Azeredo-Oliveira
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C-banding; Chromosomal rearrangements; Cytotypes; Polymorphism

Bryconamericus comprises 56 species distributed into three groups, on the basis of the position and shape of the maxillary teeth: B. exodon, B. microcephalus and B. iheringii groups. Few cytogenetic data are available for this genus, but the diploid number of 52 chromosomes is quite common, although the karyotypic variability is extensive. This study aimed to ... more

L.L.L. da Silva; L. Giuliano-Caetano; A.L. Dias
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Asteraceae; Chromomycin A3 banding; Karyotype evolution; Polyploidy

Hypochaeris is an excellent system for studying different modes of chromosome evolution in plants. We carried out a cytogenetic analysis on populations of 2 Hypochaeris species, comprising 10 populations of H. catharinensis and 5 of H. lutea, to assess possible changes on chromosome organization in this interesting genus. Conventional Feulgen staining ... more

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Fluorescence in situ hybridization; Freshwater fishes; Karyotype evolution; Molecular cytogenetics; Ribosomal DNA

In the present study, the karyotype and chromosomal characteristics of 9 species of the Bagridae fish family were investigated using conventional Giemsa staining as well as dual-color fluorescence in situ hybridization to detect the 18S and 5S rDNA sites. In addition to describing the karyotype of several Bagridae catfishes, we established molecular cytogenetic techniques to ... more

W. Supiwong; T. Liehr; M.B. Cioffi; A. Chaveerach; N. Kosyakova; X. Fan; T. Tanee; A. Tanomtong
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Ancistrini; Heterochromatin; Karyotype evolution; rDNA

The Iguaçu River basin is a tributary to the upper Paraná River in southern Brazil, and is considered an important aquatic ecoregion that, although having few species of fish, 51-71% of these are apparently endemic. Ancistrus abilhoai is one of three recently described species for this basin and is currently considered endemic to the basin. In this study, we present the ... more

M.O. Ribeiro; R.B. Noleto; C.A. Lorscheider; F.E. Porto; A.C. Prizon; C.H. Zawadzki; L.C. Oliveira; A.L.B.Portela Castro
05/10/2007
Ag-NORs; Chromomycin A3; Mystus gulio; Pisces; Rita rita; Scanning electron microscopy

The karyotypes of two species of catfish, Rita rita (Hamilton) (2n = 54; 14m + 34sm + 6st; NF = 102) and Mystus gulio (Hamilton) (2n = 58; 30m + 12sm + 2st + 14t, NF = 100) were studied through Giemsa-, silver- and chromomycin A3-staining techniques. The silver-stained karyotypes in both sexes of R. rita and M. gulio revealed that the ... more

J.K. Das; A.R. Khuda-Bukhsh
06/08/2006
Acari; Chromosomes; Hydrachnellae; Hydrodroma despiciens

The karyotypes of water mites (Acari: Hydrachnellae: Hydrodromidae) are largely unknown. The present investigation is the first report of a study designed to characterize the chromosomes of water mites. The study was carried out with specimens of Hydrodroma despiciens collected from Eber Lake in Afyon, Turkey. Several different methods were tried to obtain chromosomes of this ... more

S.Tutgun Onrat; F. Αşçı; M. Özkan

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