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Genetic structure of Sesamia nonagrioides (Lefebvre) populations in the Mediterranean area

Auteurs : La Poza (Marta De), Farinos (Gema P.), Hernandez-Crespo (Pedro), Ortego (Felix), Beroiz (Beatriz) et Castanera (Pedro)


Année de publication : 2008
Publication : Environmental entomology
Volume : 37
Fascicule : 5
Pagination : 1354-1360


Résumé :

pplyBrkRulesThe Mediterranean corn borer, Sesamia nonagrioides (Lefebvre)/ (Lepidoptera: Noctuidae), is a major pest of maize in the/ Mediterranean area. Transgenic Bt maize expressing the Cry1Ab toxin/ from the bacterium Bacillus thuringiensis can effectively control this/ pest. The characterization of S. nonagrioides population structure, at/ a large geographical scale, would provide some insight in decision/ making for resistance management. The genetic relationships among nine/ populations from Spain, one from France, one from Italy, three from/ Greece, and one from Turkey were assessed using Random Amplyfied/ Polymorphic DNA (RAPD) markers. Populations from France and Spain/ formed a cluster independent from a cluster of populations collected/ in Italy, Turkey, and Greece in a unweighted pair-group method with/ arithmetic average dendrogram constructed from Nei's genetic/ distances. Average genetic differentiation among samples was/ significant for all geographical groupings analyzed (FST = 0.160[plus/ or minus]0.014 for Spanish populations; 0.133[plus or minus]0.022 for/ Spanish and French populations; and 0.095[plus or minus]0.010 for/ Greek, Italian, and Turkish populations). Genetic differentiation was/ also significant for all paired comparisons of populations, including/ two Spanish populations separated by only 15 km with no apparent/ geographical barriers. No pattern of isolation by distance was/ observed among Mediterranean corn borer populations collected in Spain/ and France. These results suggest a limited genetic exchange between/ relatively distant S. nonagrioides populations in Europe, which might/ contribute to decreased rate of spread of resistance alleles once/ resistance has developed at a certain site.