Analyses of nucleolus organizer regions and heterochromatin of Pimelodus maculatus (Pisces, Pimelodidae).
Eighteen specimens of Pimelodus maculatus collected from Tibagi River (Sertaneja, PR, Brazil) were analyzed cytogenetically. The diploid number of 56 chromosomes was observed and karyotype was 20 M + 20 SM + 10 ST + 6 A with fundamental number (FN) of 106. Results of analyses from the nucleolus organizer regions (NORs), obtained by AgNO3, CMA3 and C-band staining showed marking in a terminal position on the long arm of a pair of subtelocentric chromosomes. The restriction enzyme AluI produced a linear differentiation similar to C-banding.
Swarça
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Universidade Estadual de Londrina, Departamento de Biologia Geral, PR, Brasil.
Giuliano-Caetano
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Dias
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D000818:Animals; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D005399:Fishes / Q000235:genetics*; D006570:Heterochromatin / Q000235:genetics*; D007621:Karyotyping; D009697:Nucleolus Organizer Region
D006570:Heterochromatin; C024669:endodeoxyribonuclease AluI; D015252:Deoxyribonucleases, Type II Site-Specific