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Abstract:

Inversion polymorphisms often have been associated with fitness variation. Cactophilic Drosophila buzzatii has been used widely for the study of the maintenance of chromosomal variation. The purpose of this paper is to address the relative importance of variable selection regimes associated with the use of three different host cacti and antagonistic pleiotropy in the maintenance of chromosomal variation. Using homokaryotypic stocks derived from several lines homozygous for four second-chromosome arrangements, we show that inversions significantly affect first-instar larva to adult viability (VT), developmental time (DT) and adult thorax length (TL). We also show that the effects of inversions on DT and VT are dependent on the cactus rearing media. The effects of polymorphic gene arrangements on life-history traits suggest the existence of trade-offs between early and late fitness components. The dosage of arrangement 2st, the ancestral gene order, was negatively correlated with DT and TL, whereas flies carrying the derived arrangements 2j and 2jq7 had longer DTs and larger TLs. Arrangements 2st and 2jq7 increased viability, at least in one of the cactus media tested. Our results suggest that environmental heterogeneity, as represented by the use of different cactus hosts and the trade-off between DT and TL, may be involved in the maintenance of the polymorphism. In addition, our data suggest that the chromosomal phylogeny may be decoupled from the evolution of the genes affecting life-history traits linked to the inversion system.

Registro:

Documento: Artículo
Título:The role of the use of different host plants in the maintenance of the inversion polymorphism in the cactophilic Drosophila buzzatii
Autor:Iriarte, P.F.; Hasson, E.
Filiación:GIBE, Departamento de Ciencias Biologicas, Universidad de Buenos Aires, Ciudad Universitaria Pab. II, (1428) Buenos Aires, Argentina
Laboratorio de Genética, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, (7600) Mar del Plata, Argentina
Palabras clave:Antagonistic pleiotropy; Cactus hosts; Drosophila; Inversion polymorphism; Life-history traits; chromosome; gene rearrangement; genetic polymorphism; genetic variance; homozygosity; inversion polymorphism; phylogeny; pleiotropy; evolution; host use; polymorphism; Drosophila buzzatii
Año:2000
Volumen:54
Número:4
Página de inicio:1295
Página de fin:1302
DOI: http://dx.doi.org/10.1111/j.0014-3820.2000.tb00562.x
Título revista:Evolution
Título revista abreviado:Evolution
ISSN:00143820
CODEN:EVOLA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00143820_v54_n4_p1295_Iriarte

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Citas:

---------- APA ----------
Iriarte, P.F. & Hasson, E. (2000) . The role of the use of different host plants in the maintenance of the inversion polymorphism in the cactophilic Drosophila buzzatii. Evolution, 54(4), 1295-1302.
http://dx.doi.org/10.1111/j.0014-3820.2000.tb00562.x
---------- CHICAGO ----------
Iriarte, P.F., Hasson, E. "The role of the use of different host plants in the maintenance of the inversion polymorphism in the cactophilic Drosophila buzzatii" . Evolution 54, no. 4 (2000) : 1295-1302.
http://dx.doi.org/10.1111/j.0014-3820.2000.tb00562.x
---------- MLA ----------
Iriarte, P.F., Hasson, E. "The role of the use of different host plants in the maintenance of the inversion polymorphism in the cactophilic Drosophila buzzatii" . Evolution, vol. 54, no. 4, 2000, pp. 1295-1302.
http://dx.doi.org/10.1111/j.0014-3820.2000.tb00562.x
---------- VANCOUVER ----------
Iriarte, P.F., Hasson, E. The role of the use of different host plants in the maintenance of the inversion polymorphism in the cactophilic Drosophila buzzatii. Evolution. 2000;54(4):1295-1302.
http://dx.doi.org/10.1111/j.0014-3820.2000.tb00562.x