Cytogenetic data on the threatened leafcutter ant Atta robusta Borgmeier, 1939 (Formicidae: Myrmicinae: Attini)

Comptes rendus biologies
Luísa Antônia Campos BarrosSilvia das Graças Pompolo

Abstract

The karyotype of the threatened ant species Atta robusta is described so as to establish the evolutionary relationships of this taxon with other leafcutter ants. Standard Giemsa staining, C-banding, NOR banding, fluorochromes CMA3/DAPI, Hsc-FA technique and Fluorescence in situ Hybridization (FISH) using 18S rDNA probe were conducted on a population from Aracruz, state of Espírito Santo, Brazil, allowing for comparisons with data available on Atta and other fungus-growing ant species. The diploid chromosome number observed for A. robusta was 2n=22, and the karyotypic formula was 18m+2sm+2st. Heterochromatic blocks were observed in the centromeric region of most chromosomes, where one pair of metacentric chromosomes is characterized by a GC-rich heterochromatic band in the interstitial region of its long arm. The detection of 18S rDNA using FISH confirmed the presence of single NOR for A. robusta. This is the first report of rDNA 18S detection using FISH for leafcutter ants. The cytogenetic results of this study confirm the information available for Atta and allow us to confirm the conserved chromosome number, morphology and banding pattern within the genus for the taxa studied to date, which included species from three out of t...Continue Reading

References

Nov 1, 1972·Experimental Cell Research·A T Sumner
Dec 2, 2008·Molecular Phylogenetics and Evolution·Maurício BacciAna Carla O Silva-Pinhati
Feb 27, 2010·Conservation Biology : the Journal of the Society for Conservation Biology·William F LauranceJavier Mateo Vega
Dec 1, 2008·Annual Review of Ecology, Evolution, and Systematics·Ary A Hoffmann, Loren H Rieseberg

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Citations

Feb 6, 2020·Comparative Cytogenetics·Hilton Jeferson Alves Cardoso de AguiarJérôme Orivel
Feb 16, 2021·Insect Molecular Biology·G A TeixeiraL A C Barros

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