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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Gabriela, C.M., Papeschi, A.G., Bressa, M.J.
Formato: JOUR
Materias:
Heteroptera
Holokinetic chromosomes
Karyotype evolution mechanisms
Multiple sex chromosomes
Rdna-FISH
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_19930771_v7_n2_p9_Gabriela
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_19930771_v7_n2_p9_Gabriela
record_format dspace
spelling todo:paper_19930771_v7_n2_p9_Gabriela2023-10-03T16:37:32Z The significance of cytogenetics for the study of karyotype evolution and taxonomy of water bugs (Heteroptera, Belostomatidae) native to Argentina Gabriela, C.M. Papeschi, A.G. Bressa, M.J. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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
Gabriela, C.M.
Papeschi, A.G.
Bressa, M.J.
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.
format JOUR
author Gabriela, C.M.
Papeschi, A.G.
Bressa, M.J.
author_facet Gabriela, C.M.
Papeschi, A.G.
Bressa, M.J.
author_sort Gabriela, C.M.
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
url http://hdl.handle.net/20.500.12110/paper_19930771_v7_n2_p9_Gabriela
work_keys_str_mv AT gabrielacm thesignificanceofcytogeneticsforthestudyofkaryotypeevolutionandtaxonomyofwaterbugsheteropterabelostomatidaenativetoargentina
AT papeschiag thesignificanceofcytogeneticsforthestudyofkaryotypeevolutionandtaxonomyofwaterbugsheteropterabelostomatidaenativetoargentina
AT bressamj thesignificanceofcytogeneticsforthestudyofkaryotypeevolutionandtaxonomyofwaterbugsheteropterabelostomatidaenativetoargentina
AT gabrielacm significanceofcytogeneticsforthestudyofkaryotypeevolutionandtaxonomyofwaterbugsheteropterabelostomatidaenativetoargentina
AT papeschiag significanceofcytogeneticsforthestudyofkaryotypeevolutionandtaxonomyofwaterbugsheteropterabelostomatidaenativetoargentina
AT bressamj significanceofcytogeneticsforthestudyofkaryotypeevolutionandtaxonomyofwaterbugsheteropterabelostomatidaenativetoargentina
_version_ 1807323845622759424

Ejemplares similares