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Chromosomal banding in three species of the genus Rineloricaria (Siluriformes, Loricariidae, Loricariinae) |
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| Authors: | T P de A Maia Lucia Giuliano-Caetano Mônica S Rodriguez Marceléia Rubert Fabio Hiroshi Takagui Ana Lúcia Dias |
| Institution: | 1. Departamento de Biologia Geral, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, PR 445, Km 380, CP 6001, Londrina, PR, 86051-970, Brazil 2. Departamento de Zoologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91501-970, Brazil 3. Departamento de Genética e Evolu??o, Universidade Federal de S?o Carlos, S?o Carlos, SP, 13565-905, Brazil |
| Abstract: | Cytogenetic analyses were conducted in three species: Rineloricaria cadeae, Rineloricaria strigilata and Rineloricaria pentamaculata. The nucleolar organizing regions (NORs) were localized at the terminal position, on the ninth pair of the complement for R. cadeae and R. strigilata, on the eighth and sixth pair of st–a, respectively; and on the fifth pair of the complement for R. pentamaculata, the first pair of st–a. Rineloricaria strigilata and R. pentamaculata showed NOR heteromorphism and polymorphism, respectively. All species showed heterochromatin in the pericentromeric regions and associated with NORs, which were chromomycin A3 (CMA3) positive, demonstrating to be GC rich. The results show that NOR is nonconservative in this genus. |
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