Vista normal Vista MARC

Host-associated genetic structure of mexican populations of the cabbage aphid brevicoryne brassicae L. (homoptera: aphididae)

Tipo de material: Artículo impreso(a) Artículo impreso(a) Idioma: Inglés Tema(s) en español: Clasificación:
  • AR/595.752 R8
Formatos físicos adicionales disponibles:
  • Disponible en línea
 En: Heredity volumen 91 (2003), páginas 415-421Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso Resumen:
Inglés

Phytophagous insects can use different host plant species across their geographic distribution. Within a locality, however, their feeding can be restricted to one or two plant species. If host species constitute different selective regimes to herbivorous insects, genetic differentiation and hostassociated local adaptation may occur. In this study, we describe the genetic structure of the aphid Brevicoryne brassicae L. associated to Brassica campestris L. and B. oleraceae var. capitata L., two plant species that occur sympatrically in four localities in the highlands of Chiapas, Mexico. The aim was to determine if the aphid populations are genetically structured in relation to the plant host species, and if such differentiation is consistent among localities. The genetic description of populations was made using 11 enzyme loci using cellulose acetate electrophoresis. Aphid genotypes were surveyed in two host plant speciesassociated populations within each of four localities at seven polymorphic loci (eight subpopulations in total). The genetic structure was assessed at the level of subpopulations, among localities, between hosts, and pairwise comparisons of hosts within locality, using Wright F-statistics. Genetic distance among localities and between host-associated populations within each locality was also estimated. We found that overall genetic differentiation was high (FST¼0.22), and that differentiation among localities (FST¼0.13) was higher than differentiation between hosts (FST¼0.03). All FST estimates were statistically significant. Pairwise comparisons of FST between hosts in each locality suggest high differentiation in two of them, and low but still significant differentiation in two other localities. Given that general environmental conditions are similar within localities, selection on each host species may produce genetic divergence within and among subpopulations of B. brassicae.

Número de sistema: 31269
Etiquetas de esta biblioteca: No hay etiquetas de esta biblioteca para este título. Ingresar para agregar etiquetas.
Valoración
    Valoración media: 0.0 (0 votos)
Existencias
Tipo de ítem Biblioteca actual Colección Signatura topográfica Info Vol Estado Código de barras
Artículos Biblioteca Campeche Artículos (AR) ECOSUR AR 595.752 R8 003 Disponible ECO040006411
Artículos Biblioteca Electrónica Recursos en línea (RE) ECOSUR Recurso digital ECO400312698106
Artículos Biblioteca San Cristóbal Artículos (AR) ECOSUR AR 595.752 R8 001 Disponible ECO010005130
Artículos Biblioteca Tapachula Artículos (AR) ECOSUR AR 595.752 R8 002 Disponible ECO020009596

Disponible para usuarios de ECOSUR con su clave de acceso

Phytophagous insects can use different host plant species across their geographic distribution. Within a locality, however, their feeding can be restricted to one or two plant species. If host species constitute different selective regimes to herbivorous insects, genetic differentiation and hostassociated local adaptation may occur. In this study, we describe the genetic structure of the aphid Brevicoryne brassicae L. associated to Brassica campestris L. and B. oleraceae var. capitata L., two plant species that occur sympatrically in four localities in the highlands of Chiapas, Mexico. The aim was to determine if the aphid populations are genetically structured in relation to the plant host species, and if such differentiation is consistent among localities. The genetic description of populations was made using 11 enzyme loci using cellulose acetate electrophoresis. Aphid genotypes were surveyed in two host plant speciesassociated populations within each of four localities at seven polymorphic loci (eight subpopulations in total). The genetic structure was assessed at the level of subpopulations, among localities, between hosts, and pairwise comparisons of hosts within locality, using Wright F-statistics. Genetic distance among localities and between host-associated populations within each locality was also estimated. We found that overall genetic differentiation was high (FST¼0.22), and that differentiation among localities (FST¼0.13) was higher than differentiation between hosts (FST¼0.03). All FST estimates were statistically significant. Pairwise comparisons of FST between hosts in each locality suggest high differentiation in two of them, and low but still significant differentiation in two other localities. Given that general environmental conditions are similar within localities, selection on each host species may produce genetic divergence within and among subpopulations of B. brassicae. Inglés

Disponible en línea

Adobe Acrobat profesional 6.0 o superior