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Allozyme Variation among Populations of the Groundnut Seed-Beetle, Caryedon serratus (Ol.) in Senegal

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Abstract

Starch gel electrophoresis was used to compare eight loci in six enzymatic systems of 17 samples of the groundnut seed-beetle, Caryedon serratus (OI.) (Coleoptera: Bruchidae) bred on five different host-plant species: Arachis hypogaea, Bauhinia rufescens, Cassia sieberiana, Piliostigma reticulatum and Tamarindus indica. The rate of polymorphism was 44.8%. The average genetic diversity (Hw) was 0.184. Allozyme variability analysis indicated that seed-beetles associated with P. reticulatum and groundnut, Arachis hypogaea were genetically similar, whereas other samples clustered according to their host plant species. Geographical distances less than 400 km were not decisive for the genetic structuring of samples associated with a given host plant.

Résumé

L’électrophorèse sur gel d’amidon a permis de comparer huit loci appartenant à six systèmes enzymatiques chez dix-sept échantillons de bruche de l’arachide provenant de cinq plantes hôtes différentes: Arachis hypogaea, Bauhinia rufescens, Cassia sieberiana, Piliostigma reticulatum et Tamarindus indica. Le taux de polymorphisme est de 44,8%. La diversité génétique moyenne (Hw) est de 0,184. L’analyse de la variabilité allozymique montre que les bruches inféodées à P. reticulatum et à l’arachide sont génétiquement très proches, alors que les autres échantillons se regroupent en fonction de leur espèce hôte. Les distances géographiques inférieures à 400 km ne sont pas déterminantes dans la structuration génétique des échantillons d’une plante hôte donnée.

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Authors and Affiliations

  1. Laboratoire de Protection des Stocks ITA-ORSTOM, B.P. 2765, Dakar, Sénégal

    M. Sembene & A. Delobel

  2. Laboratoire de Génétique et d’Amélioration des Plantes ORSTOM, B.P. 1386, Dakar, Sénégal

    J. P. Brizard

Authors
  1. M. Sembene
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  2. J. P. Brizard
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  3. A. Delobel
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Sembene, M., Brizard, J.P. & Delobel, A. Allozyme Variation among Populations of the Groundnut Seed-Beetle, Caryedon serratus (Ol.) in Senegal. Int J Trop Insect Sci 18, 77–86 (1998). https://doi.org/10.1017/S1742758400007499

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