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Abstract:

The New World grasshopper Cornops aquaticum (Leptysminae: Acrididae) shows a geographical pattern for three Robertsonian polymorphisms in its southernmost area of distribution in Argentina and Uruguay: The frequency and distribution of chiasmata were analysed in five Argentinian populations. This study reveals a strong redistribution of chiasmata in fusion carriers, with a reduction in proximal and increase of distal chiasma frequency in fusion bivalents and trivalents, when all three karyotypes were compared. However, when only fusion bivalents and trivalents were compared, chiasma frequency was significantly higher in the former than in the latter. This higher chiasma frequency in fusion bivalents is due to an increase in proximal chiasma frequency. It is argued that the reduction in proximal chiasma frequency (relative to unfused bivalents) in fusion bivalents may be due to interference across the centromere. Proximal chiasma reduction in trivalents may be attributed either to a physical effect of structural heterozygosity or to an adaptation to the polymorphic condition. Therefore the differences in the-distribution of chiasmata in trivalents and Robertsonian bivalents have different causes.

Registro:

Documento: Artículo
Título:Effects of polymorphic Robertsonian rearrangements on the frequency and distribution of chiasmata in the water-hyacinth grasshopper, Cornops aquaticum (Orthoptera: Acrididae)
Autor:Colombo, P.C.
Filiación:Laboratorio de Genética, Departamento de Ecología Genética y Evolución, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave:Acrididae; Chiasma distribution; Chiasma interference; Cornops aquaticum; Recombination; Robertsonian polymorphisms; frequency-magnitude distribution; genetic analysis; genetic structure; genetic variation; geographical distribution; grasshopper; heterozygosity; karyotype; polymorphism; recombination; Argentina; Paraguay; South America; Acrididae; Cornops aquaticum; Eichhornia crassipes; Leptysminae; Orthoptera; Robertsonia
Año:2007
Volumen:104
Número:4
Página de inicio:653
Página de fin:659
DOI: http://dx.doi.org/10.14411/eje.2007.082
Título revista:European Journal of Entomology
Título revista abreviado:Eur. J. Entomol.
ISSN:12105759
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12105759_v104_n4_p653_Colombo

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Citas:

---------- APA ----------
(2007) . Effects of polymorphic Robertsonian rearrangements on the frequency and distribution of chiasmata in the water-hyacinth grasshopper, Cornops aquaticum (Orthoptera: Acrididae). European Journal of Entomology, 104(4), 653-659.
http://dx.doi.org/10.14411/eje.2007.082
---------- CHICAGO ----------
Colombo, P.C. "Effects of polymorphic Robertsonian rearrangements on the frequency and distribution of chiasmata in the water-hyacinth grasshopper, Cornops aquaticum (Orthoptera: Acrididae)" . European Journal of Entomology 104, no. 4 (2007) : 653-659.
http://dx.doi.org/10.14411/eje.2007.082
---------- MLA ----------
Colombo, P.C. "Effects of polymorphic Robertsonian rearrangements on the frequency and distribution of chiasmata in the water-hyacinth grasshopper, Cornops aquaticum (Orthoptera: Acrididae)" . European Journal of Entomology, vol. 104, no. 4, 2007, pp. 653-659.
http://dx.doi.org/10.14411/eje.2007.082
---------- VANCOUVER ----------
Colombo, P.C. Effects of polymorphic Robertsonian rearrangements on the frequency and distribution of chiasmata in the water-hyacinth grasshopper, Cornops aquaticum (Orthoptera: Acrididae). Eur. J. Entomol. 2007;104(4):653-659.
http://dx.doi.org/10.14411/eje.2007.082