The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina

Male meiosis behaviour and heterochromatin characterization of three big water bug species were studied. Belostoma dentatum (Mayr, 1863), B. elongatum Montandon, 1908 and B. gestroi Montandon, 1903 possess 2n = 26 + X 1 X 2 Y (male). In these species, male meiosis is similar to that previously obser...

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Autores principales: Papeschi, Alba Graciela, Bressa, Maria Jose
Publicado: 2013
Materias:
Heteroptera
Holokinetic chromosomes
Karyotype evolution mechanisms
Multiple sex chromosomes
Rdna-FISH
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19930771_v7_n2_p9_Gabriela
http://hdl.handle.net/20.500.12110/paper_19930771_v7_n2_p9_Gabriela
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_19930771_v7_n2_p9_Gabriela
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spelling paper:paper_19930771_v7_n2_p9_Gabriela2023-06-08T16:32:51Z The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina Papeschi, Alba Graciela Bressa, Maria Jose Heteroptera Holokinetic chromosomes Karyotype evolution mechanisms Multiple sex chromosomes Rdna-FISH Male meiosis behaviour and heterochromatin characterization of three big water bug species were studied. Belostoma dentatum (Mayr, 1863), B. elongatum Montandon, 1908 and B. gestroi Montandon, 1903 possess 2n = 26 + X 1 X 2 Y (male). In these species, male meiosis is similar to that previously observed in Belostoma Latreille, 1807. In general, autosomal bivalents show a single chiasma terminally located and divide reductionally at anaphase I. On the other hand, sex chromosomes are achiasmatic, behave as univalents and segregate their chromatids equationally at anaphase I. The analysis of heterochromatin distribution and composition revealed a C-positive block at the terminal region of all autosomes in B. dentatum, a Cpositive block at the terminal region and C-positive interstitial dots on all autosomes in B. elongatum, and a little C-positive band at the terminal region of autosomes in B. gestroi. A C-positive band on one bivalent was DAPI negative/CMA 3 positive in the three species. The CMA 3 -bright band, enriched in GC base pairs, was coincident with a NOR detected by FISH. The results obtained support the hypothesis that all species of Belostoma with multiple sex chromosome systems preserve NORs in autosomal bivalents. The karyotype analyses allow the cytogenetic characterization and identification of these species belonging to a difficult taxonomic group. Besides, the cytogenetic characterization will be useful in discussions about evolutionary trends of the genome organization and karyotype evolution in this genus. Fil:Papeschi, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bressa, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19930771_v7_n2_p9_Gabriela http://hdl.handle.net/20.500.12110/paper_19930771_v7_n2_p9_Gabriela
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Heteroptera
Holokinetic chromosomes
Karyotype evolution mechanisms
Multiple sex chromosomes
Rdna-FISH
spellingShingle Heteroptera
Holokinetic chromosomes
Karyotype evolution mechanisms
Multiple sex chromosomes
Rdna-FISH
Papeschi, Alba Graciela
Bressa, Maria Jose
The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina
topic_facet Heteroptera
Holokinetic chromosomes
Karyotype evolution mechanisms
Multiple sex chromosomes
Rdna-FISH
description Male meiosis behaviour and heterochromatin characterization of three big water bug species were studied. Belostoma dentatum (Mayr, 1863), B. elongatum Montandon, 1908 and B. gestroi Montandon, 1903 possess 2n = 26 + X 1 X 2 Y (male). In these species, male meiosis is similar to that previously observed in Belostoma Latreille, 1807. In general, autosomal bivalents show a single chiasma terminally located and divide reductionally at anaphase I. On the other hand, sex chromosomes are achiasmatic, behave as univalents and segregate their chromatids equationally at anaphase I. The analysis of heterochromatin distribution and composition revealed a C-positive block at the terminal region of all autosomes in B. dentatum, a Cpositive block at the terminal region and C-positive interstitial dots on all autosomes in B. elongatum, and a little C-positive band at the terminal region of autosomes in B. gestroi. A C-positive band on one bivalent was DAPI negative/CMA 3 positive in the three species. The CMA 3 -bright band, enriched in GC base pairs, was coincident with a NOR detected by FISH. The results obtained support the hypothesis that all species of Belostoma with multiple sex chromosome systems preserve NORs in autosomal bivalents. The karyotype analyses allow the cytogenetic characterization and identification of these species belonging to a difficult taxonomic group. Besides, the cytogenetic characterization will be useful in discussions about evolutionary trends of the genome organization and karyotype evolution in this genus.
author Papeschi, Alba Graciela
Bressa, Maria Jose
author_facet Papeschi, Alba Graciela
Bressa, Maria Jose
author_sort Papeschi, Alba Graciela
title The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina
title_short The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina
title_full The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina
title_fullStr The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina
title_full_unstemmed The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina
title_sort significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (heteroptera, belostomatidae) native to argentina
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19930771_v7_n2_p9_Gabriela
http://hdl.handle.net/20.500.12110/paper_19930771_v7_n2_p9_Gabriela
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