Correspondence between C-Banding and Ag-NOR in the Sex Chromosomes of Belostoma Oxyurum (Belostomatidae, Heteroptera)

The mitotic and meiotic sex chromosomes of Belostoma oxyurum have been analyzed by C-banding and Ag-NOR staining. In mitotic prometaphases the Y chromosome and both telomeric regions of the X are C positive. However, at meiosis one telomeric region of the X chromosome presents always a C positive ba...

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Detalles Bibliográficos
Autor principal: Papeschi, A.G.
Formato: JOUR
Materias:
Ag-NOR banding
C-banding
Heteroptera
holokinetic chromosomes
sex chromosomes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00114545_v60_n3_p291_Papeschi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00114545_v60_n3_p291_Papeschi2023-10-03T14:09:48Z Correspondence between C-Banding and Ag-NOR in the Sex Chromosomes of Belostoma Oxyurum (Belostomatidae, Heteroptera) Papeschi, A.G. Ag-NOR banding C-banding Heteroptera holokinetic chromosomes sex chromosomes The mitotic and meiotic sex chromosomes of Belostoma oxyurum have been analyzed by C-banding and Ag-NOR staining. In mitotic prometaphases the Y chromosome and both telomeric regions of the X are C positive. However, at meiosis one telomeric region of the X chromosome presents always a C positive band, while the other telomeric region of this chromosome and the whole of the Y chromosome are light C banded during diplotene, the diffuse stage and early diakinesis. All these bands appear C positive by late diakinesis. In mitotic prometaphases, a positive Ag-NOR is revealed at one telomeric region of the X chromosome, but not in the Y chromosome. Besides, some intra and/or interindividual variation in NOR expression in the X chromosome is encountered. No positive Ag-NOR band is observed at meiosis. A comparison of the results obtained in mitotic and meiotic cells after C- and Ag-NOR banding lead to the conclusion that in Belostoma oxyurum the intermediate staining of the C-bands of the sex chromosomes at meiosis is related to both the DNA composition (repetitive DNA, rRNA genes) and its packaging (cycle of condensation). © 1995, Japan Mendel Society, International Society of Cytology. All rights reserved. Fil:Papeschi, A.G. 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_00114545_v60_n3_p291_Papeschi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ag-NOR banding
C-banding
Heteroptera
holokinetic chromosomes
sex chromosomes
spellingShingle Ag-NOR banding
C-banding
Heteroptera
holokinetic chromosomes
sex chromosomes
Papeschi, A.G.
Correspondence between C-Banding and Ag-NOR in the Sex Chromosomes of Belostoma Oxyurum (Belostomatidae, Heteroptera)
topic_facet Ag-NOR banding
C-banding
Heteroptera
holokinetic chromosomes
sex chromosomes
description The mitotic and meiotic sex chromosomes of Belostoma oxyurum have been analyzed by C-banding and Ag-NOR staining. In mitotic prometaphases the Y chromosome and both telomeric regions of the X are C positive. However, at meiosis one telomeric region of the X chromosome presents always a C positive band, while the other telomeric region of this chromosome and the whole of the Y chromosome are light C banded during diplotene, the diffuse stage and early diakinesis. All these bands appear C positive by late diakinesis. In mitotic prometaphases, a positive Ag-NOR is revealed at one telomeric region of the X chromosome, but not in the Y chromosome. Besides, some intra and/or interindividual variation in NOR expression in the X chromosome is encountered. No positive Ag-NOR band is observed at meiosis. A comparison of the results obtained in mitotic and meiotic cells after C- and Ag-NOR banding lead to the conclusion that in Belostoma oxyurum the intermediate staining of the C-bands of the sex chromosomes at meiosis is related to both the DNA composition (repetitive DNA, rRNA genes) and its packaging (cycle of condensation). © 1995, Japan Mendel Society, International Society of Cytology. All rights reserved.
format JOUR
author Papeschi, A.G.
author_facet Papeschi, A.G.
author_sort Papeschi, A.G.
title Correspondence between C-Banding and Ag-NOR in the Sex Chromosomes of Belostoma Oxyurum (Belostomatidae, Heteroptera)
title_short Correspondence between C-Banding and Ag-NOR in the Sex Chromosomes of Belostoma Oxyurum (Belostomatidae, Heteroptera)
title_full Correspondence between C-Banding and Ag-NOR in the Sex Chromosomes of Belostoma Oxyurum (Belostomatidae, Heteroptera)
title_fullStr Correspondence between C-Banding and Ag-NOR in the Sex Chromosomes of Belostoma Oxyurum (Belostomatidae, Heteroptera)
title_full_unstemmed Correspondence between C-Banding and Ag-NOR in the Sex Chromosomes of Belostoma Oxyurum (Belostomatidae, Heteroptera)
title_sort correspondence between c-banding and ag-nor in the sex chromosomes of belostoma oxyurum (belostomatidae, heteroptera)
url http://hdl.handle.net/20.500.12110/paper_00114545_v60_n3_p291_Papeschi
work_keys_str_mv AT papeschiag correspondencebetweencbandingandagnorinthesexchromosomesofbelostomaoxyurumbelostomatidaeheteroptera
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