Genetic structure and clonal diversity of an introduced pest in Chile, the cereal aphid Sitobion avenae

In Chile, the aphid Sitobion avenae is of recent introduction, lives on cultivated and wild Poaceae, and is thought to reproduce by permanent parthenogenesis. In order to study the genetic variability and population structure of this species, five microsatellite loci were typed from individual aphid...

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Bibliographic Details
Published in:Heredity 2005-07, Vol.95 (1), p.24-33
Main Authors: Figueroa, C.C, Simon, J.C, Le Gallic, J.F, Prunier-Leterme, N, Briones, L.M, Dedryver, C.A, Niemeyer, H.M
Format: Article
Language:English
Subjects:
Agriculture
Animals
Aphidoidea
Aphids - genetics
Biomedical and Life Sciences
Biomedicine
Chile
Clone Cells
Cytogenetics
Ecology
Evolutionary Biology
Fluctuations
genetic markers
Genetic structure
genetic variation
Genetics, Population
Genotypes
Geographical distribution
Geography
heterozygosity
Host plants
Human Genetics
Human health and pathology
insect pests
introduced species
Life Sciences
loci
Microsatellite Repeats
original-article
Parthenogenesis
Pest Control
Plant Genetics and Genomics
Plants, Edible
Poaceae
Population structure
Rhopalosiphum padi
Sitobion avenae
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Summary:In Chile, the aphid Sitobion avenae is of recent introduction, lives on cultivated and wild Poaceae, and is thought to reproduce by permanent parthenogenesis. In order to study the genetic variability and population structure of this species, five microsatellite loci were typed from individual aphids collected from different cultivated and wild host plants, from different geographical zones, and years. Chilean populations showed a high degree of heterozygosity and a low genetic variability across regions and years, with four predominant genotypes representing nearly 90% of the sample. This pattern of low clonal diversity and high heterozygosity was interpreted as the result of recent founder events from a few asexually reproducing genotypes. Most geographical and temporal variation observed in the genetic composition resulted from fluctuations of a few predominant clones. In addition, comparisons of the genotypes found in Chile with those described in earlier surveys of S. avenae populations in Western Europe led us to identify 'superclones' with large geographical distribution and high ecological success, and to make a preliminary exploration of the putative origin(s) of S. avenae individuals introduced to Chile.
ISSN:0018-067X
1365-2540
0018-067X
DOI:10.1038/sj.hdy.6800662