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Related GMR Articles

Cytogenetics; Holocentric chromosomes; Meiosis; Nucleolus; Spermatogenesis; Triatomines

Triatomines are of great concern in public health because they are vectors of Chagas’ disease. This study presents an analysis of the species Triatoma melanosoma. The cytogenetic characteristics of triatomines include holocentric chromosomes, post-reductional meiosis in the sex chromosomes and nucleolar fragmentation in the meiotic cycle. The methodology utilized consisted of the ... more

V.B. Bardella; M.T.V. Azeredo-Oliveira; E. Tartarotti
Cytogenetics; cytotaxonomy; morphology; Polyploidy

Somatic chromosome numbers were determined for 20 new germplasm accessions of Paspalum, belonging to 17 species collected in Brazil. Chromosome number is reported for the first time for P. reduncum (2n = 18), P. cinerascens (2n = 20), P. cordatum (2n = 20), P. filgueirasii (2n = 24), P. ammodes (2n = 36), P. bicilium (2n = 40), ... more

A.P.S. Peñaloza; A.L. Côrtes; M.T. Pozzobon; S. Santos; G.H. Rua; J.F.M. Valls
chromosome; Cytogenetics; Euphorbia heterophylla; Nucleolus

Euphorbia heterophylla L. (Euphorbiaceae) is a herbaceous species of great economic importance due to its invasive potential and consequent damage to agriculture and pasture land. For the first time, we provide information on its chromosome number, morphology, and behavior of mitotic chromosomes. Seeds were germinated and submitted to four treatments to obtain metaphases: 0.5% ... more

J.R. Aarestrup; D. Karam; G.W. Fernandes
C. denticulata; Chelonoidis carbonaria; Cytogenetics; Morphotype; Tortoises
T.L. Silva
Brasiliensis subcomplex; Cytogenetics; Lacto-acetic orcein; Meiosis; Triatomine

Triatoma melanocephala is a rare species of Hemiptera. It belonged to the Brasiliensis subcomplex and presents morphological characteristics very close to those of Triatoma vitticeps. We investigated spermatogenesis of T. melanocephala and compared it with that of T. vitticeps in order to determine whether these organisms have similar cytogenetic ... more

K.C.C. Alevi; P.P. Mendonça; N.P. Pereira; J.A. Rosa; M.T.V. Azeredo-Oliveira
Cobalt chloride; Cytogenetics; Metaphase; Stingless bee

In order to optimize preparations of bee metaphases, we tested cobalt chloride, which has been used as a metaphase inducer in other organisms, such as hamsters and fish. Four microliters of 65 mM cobalt chloride aqueous solution was topically applied to larval and pupal stages of the stingless bee Melipona scutellaris. The cerebral ganglion was removed after treatment and ... more

C. Ueira-Vieira; R.R. Tavares; S. Morelli; B.B. Pereira; R.P. Silva; A.R. Torres-Mariano; W.E. Kerr; A.M. Bonetti
Brasiliensis subcomplex; Cytogenetics; Holocentric chromosomes; Meiosis; Triatomine

All species of Triatominae are susceptible to infection by Trypanosoma cruzi (Kinetoplastida: Trypanosomatidae) and consequently, potential insect vectors of Chagas disease. Currently, there are 140 known species of triatomine bugs, which can be grouped into specific species complexes. The species Triatoma lenti (Hemiptera: Triatominae) is found only in Brazil and is ... more

K.C.C. Alevi; P.P. Mendonça; M. Succi; N.P. Pereira; J.A. Rosa; M.T.V. Azeredo-Oliveira
Biodiversity; Cytogenetics; Fluorochromes; Heterochromatin; Loricariidae

Loricariidae (Siluriformes, Hypostominae) is one of the most diverse catfish families. In spite of the wide distribution of loricariids in South America, cytogenetic reports are available for only a few species, mostly from southern and southeastern Brazil. We made the first chromosomal analysis of Hypostomus aff. unae from the Contas River basin in northeastern Brazil. ... more

J.A. Bitencourt; P.R.A.M. Affonso; L. Giuliano-Caetano; P.L.S. Carneiro; A.L. Dias
Brazilwood; Caesalpinieae; Cytogenetics; Evolution

With the purpose of addressing the pattern of karyotype evolution in Caesalpinia species, chromosome morphology was characterized in five species from Brazil, and karyotypic asymmetry was analyzed in 14 species from South America. All accessions had the chromosome number 2n = 24, which was first described here for Caesalpinia laxiflora Tul. and Cenostigma ... more

P.S. Rodrigues; M.M. Souza; R.X. Corrêa
Chromosome evolution; Chromosome number variation; Cytogenetics; Cytotypes; Karyotype; Whole-genome duplication

The aim of this study was to examine the hypothesis that plants with higher ploidy levels are selected by environments under more extremely stressful conditions than the same (or closely related) species from less rigorous terrestrial or epiphytic habitats. Therefore, we analyzed the chromosome numbers of 26 species belonging to 21 genera and 13 families of angiosperms that were collected ... more

S.R. Pitrez; L.A. Andrade; F.N.M. Assis; L.P. Felix