Eur. J. Entomol. 106 (1): 1-9, 2009 | DOI: 10.14411/eje.2009.001
Chromosomal differentiation among bisexual European species of Saga (Orthoptera: Tettigoniidae: Saginae) detected by both classical and molecular methods
- 1 Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Kraków, Poland; e-mail: warchalowska@isez.pan.krakow.pl
- 2 Institute of Cytology and Genetics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
- 3 Institute of Zoology, Bulgarian Academy of Sciences, Tsar Osvoboditel 1, 1000 Sofia, Bulgaria
We report the karyotype characteristics including chromosome numbers of Saga campbelli campbelli, S. c. gracilis, and S. rammei using the following classical cytogenetic methods: C-banding, silver staining, and fluorochrome staining DAPI and CMA3. We also present FISH data showing the distribution of telomeric repeats and 18S rDNA on the chromosomes of these species and the results of similar studies cited in the literature on S. hellenica, S. natoliae, and S. rhodiensis. The five European Saga species exhibit a high rate of karyotype evolution. In addition to changes in chromosome number and morphology (by chromosomal inversion and/or chromosome fusion), interspecific autosomal differentiation involved changes in the distribution and quantity of constitutive heterochromatin and GC-rich regions, as well as the number and location of NORs. In the present study we focused on testing a hypothetical model of karyotype evolution in Saga, with particular reference to the cytogenetic mapping of rDNA and telomeric sequences. Variation in the distribution of rDNA and location of Ag-NORs are novel phylogenetic markers for the genus Saga.
Keywords: Orthoptera, Saginae, Saga, karyotype, Ag-NOR, FISH, chromosome, rDNA, telomeric repeats
Received: July 4, 2008; Revised: September 1, 2008; Accepted: September 1, 2008; Published: March 10, 2009 Show citation
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