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Marine Biology

, Volume 139, Issue 1, pp 55–60 | Cite as

Chromosomal evolution in Mugilidae: karyotype characterization of Liza saliens and comparative localization of major and minor ribosomal genes in the six Mediterranean mullets

  •  E. Gornung
  •  C. Cordisco
  •  A. Rossi
  • De S. Innocentiis
  •  D. Crosetti
  •  L. Sola

Abstract.

This study continues a comparative cytogenetic analysis of the fish family Mugilidae, reporting the karyotype characterization of the leaping mullet, Liza saliens, by C-banding, Ag- and fluorochrome-staining, and completing the fluorescence in situ hybridization (FISH)-mapping of the 18S and 5S rRNA genes (rDNA) to the chromosomes of the six Mediterranean mullets, namely L. saliens, L. ramada, L. aurata, Mugil cephalus, Chelon labrosus and Oedalechilus labeo. In all species, except M. cephalus, the 5S rDNA sites were localized on a medium-sized acrocentric chromosome pair, which was considered homeologous in all of them. In L. saliens, an additional 5S rDNA site was detected in a location close to the one shown by major ribosomal genes in M. cephalus, i.e. the subtelomeric region of chromosome pair 1. The 5S rDNA site in M. cephalus is located on the smallest chromosome pair of the complement, which, on the other hand, though on a different position, bears 18S rDNA in all the species of Liza and Chelon examined. The heterochromatin composition and the major and minor ribosomal gene locations suggest that the karyotype of L. saliens (subgenus Protomugil) can be considered intermediate between the karyotype of the more primitive M. cephalus and those of the other Liza (subgenus Liza) species and of the representatives of the more derived genera Chelon and Oedalechilus.

Keywords

Chromosome Pair Small Chromosome Chromosomal Evolution Acrocentric Chromosome Subtelomeric Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  •  E. Gornung
    • 1
  •  C. Cordisco
    • 2
  •  A. Rossi
    • 1
  • De S. Innocentiis
    • 2
  •  D. Crosetti
    • 2
  •  L. Sola
    • 1
  1. 1.Department of Animal and Human Biology, University of Rome 1, Via A. Borelli 50, 00161 Rome, Italy
  2. 2.ICRAM, Central Institute for Marine Research, Via di Casalotti, 300, 00166 Rome, Italy

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