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Abstract:

Leptysma argentina is a highly polymorphic South-American grasshopper from the cytological point of view; all populations so far studied carry a polymorphic fusion between pairs 3 and 6. In heterozygotes, the trivalent 3-3/6-6 shows alternate orientation in 97.17% of the cells. Trivalent chiasma frequency is significantly lower than in the combined 3 and 6 bivalents of the standard homozygote; besides, there is a marked displacement of chiasmata to a distal position. In structural homozygotes the same effects, but not so marked, were observed. One individual was a double heterozygote for both the polymorphic centric fusion and a spontaneous one between pairs 5 and 7. The presence of a fragment, sometimes associated with the centromeric region of the nonfused 5 chromosome, was detected in more than 50% of the cells. The orientation of trivalent 5-5/7-7 in metaphase I was highly irregular (36% linear orientation). Neither frequency nor position of chiasmata were altered in trivalent 5-5/7-7 when compared with bivalents 5+7 of normal individuals. The results suggest that proximal and interstitial chiasma reduction observed in trivalent 3-3/6-6 of L. argentina is due to a later adaptation to the polymorphic condition or a fortuitous genetic condition present in the original mutant, rather than to a direct effect of the fusion itself on chiasma distribution. © 1987 Dr W. Junk Publishers.

Registro:

Documento: Artículo
Título:Effects of centric fusions on chiasma frequency and position in Leptysma argentina (Acrididae: Orthoptera) I. Spontaneous and stable polymorphic centric fusions
Autor:Colombo, P.C.
Filiación:Laboratorio de Genética, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Año:1987
Volumen:72
Número:3
Página de inicio:171
Página de fin:179
DOI: http://dx.doi.org/10.1007/BF00116220
Título revista:Genetica
Título revista abreviado:Genetica
ISSN:00166707
CODEN:GENEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v72_n3_p171_Colombo

Referencias:

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  • Bidau, C. J., 1984. Estudios citogenétices en Orthoptera de Sudamérica. Dr. Sc. Thesis, Universidad de Buenos Aires; Bidau, C.J., Hasson, E.R., Population cytology of Leptysma argentina Bruner (Leptysminae: Acrididae) (1984) Genetica, 62, pp. 161-175
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Citas:

---------- APA ----------
(1987) . Effects of centric fusions on chiasma frequency and position in Leptysma argentina (Acrididae: Orthoptera) I. Spontaneous and stable polymorphic centric fusions. Genetica, 72(3), 171-179.
http://dx.doi.org/10.1007/BF00116220
---------- CHICAGO ----------
Colombo, P.C. "Effects of centric fusions on chiasma frequency and position in Leptysma argentina (Acrididae: Orthoptera) I. Spontaneous and stable polymorphic centric fusions" . Genetica 72, no. 3 (1987) : 171-179.
http://dx.doi.org/10.1007/BF00116220
---------- MLA ----------
Colombo, P.C. "Effects of centric fusions on chiasma frequency and position in Leptysma argentina (Acrididae: Orthoptera) I. Spontaneous and stable polymorphic centric fusions" . Genetica, vol. 72, no. 3, 1987, pp. 171-179.
http://dx.doi.org/10.1007/BF00116220
---------- VANCOUVER ----------
Colombo, P.C. Effects of centric fusions on chiasma frequency and position in Leptysma argentina (Acrididae: Orthoptera) I. Spontaneous and stable polymorphic centric fusions. Genetica. 1987;72(3):171-179.
http://dx.doi.org/10.1007/BF00116220