title: Analyses of nucleolus organizer regions and heterochromatin of Pimelodus maculatus (Pisces, Pimelodidae).
abstract: 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.
authors.affiliation: Universidade Estadual de Londrina, Departamento de Biologia Geral, PR, Brasil.
authors.forename: A C
authors.initials: AC
authors.lastname: Swarça
authors.forename: L
authors.initials: L
authors.lastname: Giuliano-Caetano
authors.forename: A L
authors.initials: AL
authors.lastname: Dias
mesh_terms: D000818:Animals; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D005399:Fishes / Q000235:genetics*; D006570:Heterochromatin / Q000235:genetics*; D007621:Karyotyping; D009697:Nucleolus Organizer Region
chemical_list: D006570:Heterochromatin; C024669:endodeoxyribonuclease AluI; D015252:Deoxyribonucleases, Type II Site-Specific