Intraspecific variation ofDrosophila buzzatii larval breeding success onOpuntia: A yeast-plant-insect relationship |
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Authors: | B Moreteau Y Carton M C Pignal and J R Davis |
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Institution: | (1) Laboratoire de Biologie et Génétique Evolutives, Centre National de la Recherche Scientifique, F-91198 Gif-sur-Yvette Cedex, France;(2) Département de Biologie végétale, Université Claude Bernard (Lyon I), Bât 405, 43 Boulevard du 11 November 1918, F-69622 Villeurbanne Cedex, France |
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Abstract: | The cactophilic species,Drosophila buzzatii, normally breeds in decaying pockets ofOpuntia cladodes, in which there is a complex interaction with the microbial flora, especially yeast species. Isofemale lines were used to estimate genetic variation among larvae reared on their natural feeding substrate. Four naturally occurring cactophilic yeast species isolated from the same Tunisian oasis as theDrosophila population were used. Two fitness components were studied for each line, viability and developmental time. Genetic variations amongD. buzzatii lines were observed for both traits. A significant yeast species x isofemale line interaction for viability was also evidenced, suggesting the occurrence of specialized genotypes for the utilization of breeding substrates. This genetic heterogeneity in the natural population may favor a better adaptation to the patchily distribution of yeasts. |
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Keywords: | Isofemale lines yeasts Opuntia plant-insect relationship genetic variability viability developmental time Drosophila buzzatii |
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