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NOR polymorphism in the Iberian species Chondrostoma lusitanicum (Pisces: Cyprinidae)

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Abstract

Chromosomal polymorphism regarding number of NOR sites in the cyprinid fish Chondrostoma lusitanicum was examined using C-banding, silver-staining (Ag), and fluorescent staining with chromomycin A3 (CMA3). The analysis of heterochromatic regions allowed a more precise identification of the centromeric regions and the proposal of a revised haploid chromosome formula (7M: 15S: 3A). We describe variability in the number of NOR regions per genome, number of active NOR sites per cell, and relative size of individual NORs. Individuals expressed two or four NOR-bearing chromosomes. Polymorphism was detected in all the populations studied and sex-related differences were not found. The observed chromosomal NOR phenotypes suggest the occurrence of structural rearrangements during the evolutionary process of this diploid leuciscine cyprinid.

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  1. Dept. de Zoologia e Antropologia, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Edifício C2, 3° Piso, 1700, Lisboa, Portugal

    Elsa Rodrigues & Maria João Collares-Pereira

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  1. Elsa Rodrigues
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  2. Maria João Collares-Pereira
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Rodrigues, E., Collares-Pereira, M.J. NOR polymorphism in the Iberian species Chondrostoma lusitanicum (Pisces: Cyprinidae). Genetica 98, 59–63 (1996). https://doi.org/10.1007/BF00120219

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  • DOI: https://doi.org/10.1007/BF00120219

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