Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae)

Species of Pentatomidae are cytogenetically characterized by the presence of holokinetic chromosomes, a pre-reductional type of meiosis, and a great constancy not only in chromosome number (2n = 14 in 85% of the 250 species analyzed) but also in the sex chromosome determining system (XY/XX). Edessa...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Rebagliati, P.J., Papeschi, A.G., Mola, L.M.
Formato: JOUR
Materias:
Edessa
Fluorescent banding
Heteroptera
Holokinetic chromosomes
Meiosis
chromosome
Pentatomidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_12105759_v100_n1_p11_Rebagliati
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_12105759_v100_n1_p11_Rebagliati
record_format dspace
spelling todo:paper_12105759_v100_n1_p11_Rebagliati2023-10-03T16:08:58Z Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae) Rebagliati, P.J. Papeschi, A.G. Mola, L.M. Edessa Fluorescent banding Heteroptera Holokinetic chromosomes Meiosis chromosome Edessa Heteroptera Pentatomidae Species of Pentatomidae are cytogenetically characterized by the presence of holokinetic chromosomes, a pre-reductional type of meiosis, and a great constancy not only in chromosome number (2n = 14 in 85% of the 250 species analyzed) but also in the sex chromosome determining system (XY/XX). Edessa meditabunda and E. rufomarginata males have 2n = 14 = 12 + XY, and both species present small telomeric positively heteropycnotic bands which are DAPI and CMA bright. In E. meditabunda the NOR region is clearly revealed at the telomeric region of the largest autosomal pair by silver staining and CMA banding. Meiotic behaviour of both species follows the general pattern of the order: autosomes divide pre-reductionally, sex chromosomes are achiasmatic and divide postreductionally, and at both metaphase plates the autosomes become arranged in a circle with the sex chromosomes lying at its center. In E. meditabunda, however, the larger sex chromosome is generally observed at metaphase I forming part of the ring of autosomal bivalents. Bivalents with two chiasmata are frequently observed in E. meditabunda and E. rufomarginata; mean chiasma frequency (6.45 and 6.26, respectively) differ significantly between both species, but differences between populations within each species are not significant. The metaphase plate arrangement of autosomes and sex chromosomes is rather constant in Heteroptera. However, our results in E. meditabunda together with previous reports in other species of the order led us to suggest that the metaphase plate arrangement is more liable to variation at the first meiotic division than at the second one, when it is almost constant. The presence of ring bivalents in both species here analyzed constitutes further evidence against the previous statement of only one chiasma per bivalent in Heteroptera. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_12105759_v100_n1_p11_Rebagliati
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Edessa
Fluorescent banding
Heteroptera
Holokinetic chromosomes
Meiosis
chromosome
Edessa
Heteroptera
Pentatomidae
spellingShingle Edessa
Fluorescent banding
Heteroptera
Holokinetic chromosomes
Meiosis
chromosome
Edessa
Heteroptera
Pentatomidae
Rebagliati, P.J.
Papeschi, A.G.
Mola, L.M.
Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae)
topic_facet Edessa
Fluorescent banding
Heteroptera
Holokinetic chromosomes
Meiosis
chromosome
Edessa
Heteroptera
Pentatomidae
description Species of Pentatomidae are cytogenetically characterized by the presence of holokinetic chromosomes, a pre-reductional type of meiosis, and a great constancy not only in chromosome number (2n = 14 in 85% of the 250 species analyzed) but also in the sex chromosome determining system (XY/XX). Edessa meditabunda and E. rufomarginata males have 2n = 14 = 12 + XY, and both species present small telomeric positively heteropycnotic bands which are DAPI and CMA bright. In E. meditabunda the NOR region is clearly revealed at the telomeric region of the largest autosomal pair by silver staining and CMA banding. Meiotic behaviour of both species follows the general pattern of the order: autosomes divide pre-reductionally, sex chromosomes are achiasmatic and divide postreductionally, and at both metaphase plates the autosomes become arranged in a circle with the sex chromosomes lying at its center. In E. meditabunda, however, the larger sex chromosome is generally observed at metaphase I forming part of the ring of autosomal bivalents. Bivalents with two chiasmata are frequently observed in E. meditabunda and E. rufomarginata; mean chiasma frequency (6.45 and 6.26, respectively) differ significantly between both species, but differences between populations within each species are not significant. The metaphase plate arrangement of autosomes and sex chromosomes is rather constant in Heteroptera. However, our results in E. meditabunda together with previous reports in other species of the order led us to suggest that the metaphase plate arrangement is more liable to variation at the first meiotic division than at the second one, when it is almost constant. The presence of ring bivalents in both species here analyzed constitutes further evidence against the previous statement of only one chiasma per bivalent in Heteroptera.
format JOUR
author Rebagliati, P.J.
Papeschi, A.G.
Mola, L.M.
author_facet Rebagliati, P.J.
Papeschi, A.G.
Mola, L.M.
author_sort Rebagliati, P.J.
title Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae)
title_short Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae)
title_full Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae)
title_fullStr Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae)
title_full_unstemmed Meiosis and fluorescent banding in Edessa meditabunda and E. rufomarginata (Heteroptera: Pentatomidae: Edessinae)
title_sort meiosis and fluorescent banding in edessa meditabunda and e. rufomarginata (heteroptera: pentatomidae: edessinae)
url http://hdl.handle.net/20.500.12110/paper_12105759_v100_n1_p11_Rebagliati
work_keys_str_mv AT rebagliatipj meiosisandfluorescentbandinginedessameditabundaanderufomarginataheteropterapentatomidaeedessinae
AT papeschiag meiosisandfluorescentbandinginedessameditabundaanderufomarginataheteropterapentatomidaeedessinae
AT molalm meiosisandfluorescentbandinginedessameditabundaanderufomarginataheteropterapentatomidaeedessinae
_version_ 1807322178464514048

Ejemplares similares