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Abstract:

Natural populations of Dichroplus elongatus often exhibit diverse forms of supernumerary heterochromatin. In Tafi Viejo, Tucumán (Argentina), parallel polymorphisms for extra segments on pairs M6, S9 (proximal) and S10 (distal) and a mitotically unstable B chromosome were detected. The segments produce intrachromosome effects excluding chiasmata from their neigbourhood and displacing them to regions distal to the extra heterochromatin. The individuals bearing simultaneously the B and the segment on M6 show a decrease in the frequency of interstitial chismata (Xi) while those carrying only segments on M6 or S10 have an increase of this variable when compared with standard males. The between cell variance of Xi is also higher in M6 segment carriers. B individuals present an increase of abnormal spermatid frequency which may be explained by the simultaneous occurrence of two mechanisms: 1) lagging of supernumeraries and 2) physiological effects of B's affecting the meiosis even in cells lacking them. The intra and interchromosome effects may be important for the plasticity of populations allowing recombination to explore new chromosome regions. The B polymorphism seems to be stable which points to an advantage of B carriers and/or the occurrence of accumulation mechanisms counterbalancing their negative effects on fertility. © 1991 Kluwer Academic Publishers.

Registro:

Documento: Artículo
Título:Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility
Autor:Loray, M.A.; Remis, M.I.; Vilardi, J.C.
Filiación:Depto. de Ciencias Biológicas, Fac. Cs. Exactas y Naturales, Univ. de Buenos Aires, 1428, Argentina
Consejo Nacional de Investigaciones Cientificas y Técnicas, Argentina
Año:1991
Volumen:84
Número:3
Página de inicio:155
Página de fin:163
DOI: http://dx.doi.org/10.1007/BF00127242
Título revista:Genetica
Título revista abreviado:Genetica
ISSN:00166707
CODEN:GENEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v84_n3_p155_Loray

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Citas:

---------- APA ----------
Loray, M.A., Remis, M.I. & Vilardi, J.C. (1991) . Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility. Genetica, 84(3), 155-163.
http://dx.doi.org/10.1007/BF00127242
---------- CHICAGO ----------
Loray, M.A., Remis, M.I., Vilardi, J.C. "Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility" . Genetica 84, no. 3 (1991) : 155-163.
http://dx.doi.org/10.1007/BF00127242
---------- MLA ----------
Loray, M.A., Remis, M.I., Vilardi, J.C. "Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility" . Genetica, vol. 84, no. 3, 1991, pp. 155-163.
http://dx.doi.org/10.1007/BF00127242
---------- VANCOUVER ----------
Loray, M.A., Remis, M.I., Vilardi, J.C. Parallel polymorphisms for supernumerary heterochromatin in Dichroplus elongatus (Orthoptera): - Effects on recombination and fertility. Genetica. 1991;84(3):155-163.
http://dx.doi.org/10.1007/BF00127242