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Abstract:

The species of Odonata are cytogenetically characterised by possessing holokinetic chromosomes, a post-reductional meiosis, an XX/X0 (female/male) sex chromosome mechanism, m-chromosomes, and only one chiasma per bivalent. Chromosome studies were performed on males of Erythrodiplax nigricans and Coryphaeschna perrensi from Argentina. Erythrodiplax nigricans has n=12+XO and lacks m-chromosomes, while C. perrensi has 2n=27, n=13+XO, m-chromosomes and a large autosomal pair associated with the nucleolus. The meiotic behaviour of both species follows the general pattern of the order: the X chromosome is positively heteropycnotic during early prophase I; bivalents regularly show only one chiasma; all chromosomes migrate synchronously and almost parallel to the equatorial plane at anaphase I; at metaphase II the X chromosome is present in all the cells as a consequence of the post-reductional division, lies outside the metaphasic plate, and migrates asynchronously with the autosomes at anaphase II. In C. perrensi, the largest bivalent exhibits two chiasmata in a large proportion of cells, which is a very rare feature among dragonflies. Heterochromatin characterisation with DAPI-CMA banding reveals that C. perrensi does not show fluorescent banding, except for a CMA bright band at one telomeric region of the largest bivalent, associated with the NOR region; in E. nigricans, autosomes have small AT-rich telomeric blocks, except for the smallest pair, which exhibits conspicuous bands in both telomeric regions, one being GC-rich and the other AT-rich. Taking into account that the m-chromosomes have been found in other E. nigricans populations, their absence in the studied population may be due to the presence of such heterochromatic blocks. © 2008 Taylor & Francis Group, LLC.

Registro:

Documento: Artículo
Título:Fluorescent banding and meiotic behaviour in erythrodiplax nigricans (libellulidae) and coryphaeschna perrensi (aeschnidae) (anisoptera, odonata)
Autor:De Diego, G.; Rebagliati, P.J.; Mola, L.M.
Filiación:Laboratorio de Citogenética y Evolución, Departamento de Ecología Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes y Costanera Norte, 1428 Ciudad Universitaria. Ciudad Autónoma de, Buenos Aires, Argentina
Nacional Research Council (CONICET), Argentina
Palabras clave:Coryphaeschna perrensi; DAPI–CMA banding; Erythrodiplax nigricans; Heterochromatin; Holokinetic chromosomes; Meiosis; Odonata; Aeshnidae; Anisoptera (dragonflies); Coryphaeschna perrensi; Erythrodiplax nigricans; Libellulidae; Odonata
Año:2008
Volumen:61
Número:1
Página de inicio:60
Página de fin:67
DOI: http://dx.doi.org/10.1080/00087114.2008.10589610
Título revista:Caryologia
Título revista abreviado:Caryologia
ISSN:00087114
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v61_n1_p60_DeDiego

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Citas:

---------- APA ----------
De Diego, G., Rebagliati, P.J. & Mola, L.M. (2008) . Fluorescent banding and meiotic behaviour in erythrodiplax nigricans (libellulidae) and coryphaeschna perrensi (aeschnidae) (anisoptera, odonata). Caryologia, 61(1), 60-67.
http://dx.doi.org/10.1080/00087114.2008.10589610
---------- CHICAGO ----------
De Diego, G., Rebagliati, P.J., Mola, L.M. "Fluorescent banding and meiotic behaviour in erythrodiplax nigricans (libellulidae) and coryphaeschna perrensi (aeschnidae) (anisoptera, odonata)" . Caryologia 61, no. 1 (2008) : 60-67.
http://dx.doi.org/10.1080/00087114.2008.10589610
---------- MLA ----------
De Diego, G., Rebagliati, P.J., Mola, L.M. "Fluorescent banding and meiotic behaviour in erythrodiplax nigricans (libellulidae) and coryphaeschna perrensi (aeschnidae) (anisoptera, odonata)" . Caryologia, vol. 61, no. 1, 2008, pp. 60-67.
http://dx.doi.org/10.1080/00087114.2008.10589610
---------- VANCOUVER ----------
De Diego, G., Rebagliati, P.J., Mola, L.M. Fluorescent banding and meiotic behaviour in erythrodiplax nigricans (libellulidae) and coryphaeschna perrensi (aeschnidae) (anisoptera, odonata). Caryologia. 2008;61(1):60-67.
http://dx.doi.org/10.1080/00087114.2008.10589610