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| Carvalho,Rafael Augusto de; Sanchez,Sebástian; Swarça,Ana Claudia; Fenocchio,Alberto Sergio; Martins-Santos,Isabel C.; Dias,Ana Lúcia. |
| This study presents chromosomal data of Megalonema platanum from rio Tibagi, Paraná, Brazil and from rio Paraná, Argentina. The diploid number was equal 54 with karyotype composition of 24m+16sm+2st+12a in both populations. The AgNOR sites were detected in the terminal position of a submetacentric pair of the two analyzed populations, coinciding with secondary constrictions on the short arm of pair 15. CMA3 and FISH with 18S rDNA probe displayed fluorescent signals that correspond to the AgNOR sites and secondary constriction. The presence of a small acrocentric supernumerary chromosome can be observed in M. platanum from rio Tibagi, with centromeric heterochromatin. Others heterochromatic blocks were evidenced in the terminal position of some chromosome... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytogenetics; C-banding; CMA3; FISH; NORs; Pimelodidae. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100017 |
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| Swarça,Ana Claudia; Orsi,Mário Luis; Takagui,Fábio Hiroshi; Dias,Ana Lucia; Dergam,Jorge Abdala; Fenocchio,Alberto Sérgio. |
| ABSTRACT The present report represents the first cytogenetic description of Steindachneridion doceanum, great catfish which is currently at high extinction risk and it is listed as threatened on the red list of the Brazilian Ministry of the Environment, also are suggested karyotype relationships with other species of the same genus endemic from other river basins. The results revealed a diploid number of 2n = 56 and the karyotype composed of 18 metacentric, 20 submetacentric, 10 subtelocentric and 8 acrocentric chromosomes (NF = 104). The AgNORs and CMA3 signals were coincident in location occupying the short arm of an acrocentric chromosome pair (25th), in a secondary constriction. The 5S rDNA genes were localized on the short arms of one subtelocentric... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AgNORS; C band; Karyotype; South American Catfish; Threatened species. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400203 |
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