Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Polymorphism of the hereditary rhabdovirus sigma in wild populations of its host, Drosophila melanogaster | Genet Sei Evol 1991 23 25-37 Elsevier INRA 25 Original article Polymorphism of the hereditary rhabdovirus sigma in wild populations of its host Drosophila melanogaster A Fleuriet Université de Clermont Ferrand II Laboratoire de Génétique 63177 Aubière Cedex France Received 6 July 1990 accepted 22 November 1990 Summary - In natural populations of Drosophila melanogasterthroughout the world a minority of flies are infected by a rhabdovirus sigma which is not contagious but is transmitted through gametes. Transmission of the virus by males is a cornerstone for its maintenance in populations. The experiments reported in this paper show that in the wild European populations examined the efficiency of transmission by males is determined mainly by viral genotype. In African populations genetic coadaptation of both partners can lead to a very low transmission of the virus by males. Evidence is also given of the coexistence in populations of different genotypes of the virus. The situation reported is thus another example of the genetic polymorphism displayed by the sigma virus in the wild. Drosophila melanogaster I sigma virus polymorphism vertical transmission Resume Polymorphisme du virus héréditaire sigma dans les populations naturelies de son hôte Drosophila melanogaster. Dans les populations naturelies de Drosophila melanogaster quelle que soil leur origine géographique un rhabdovirus sigma est habituellement present dans un petit nombre d individus ce virus n est pas contagieux mais uniquement transmis par les gametes. Pour sa perpetuation dans les populations le virus est dependant de sa transmission par les males. Les experiences presentees id montrent que dans les populations européennes examinees I efficacite de transmission par les males depend surtout du genotype viral. Dans les populations africaines le virus est très peu transmis par ies males ce qui peut être dũ à une coadaptation génétique des 2 partenaires. Differents genotypes du virus coexistent dans les
