tailieunhanh - báo cáo khoa học: "Endemic microorganisms of a Drosophila simulans strain and their relationships with the non-mendelian transmission of a character"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Endemic microorganisms of a Drosophila simulans strain and their relationships with the non-mendelian transmission of a character | Génét. Sél. Evol. 1986 18 2 131-144 Endemic microorganisms of a Drosophila simulans strain and their relationships with the non-mendelian transmission of a character . COMENDADOR Nadine PLUS c. LOUIS and M. LOPEZ-FERBER with the technical collaboration of Andree KUHL and G. KUHL Departamento de Genética Facultad de Biologia Universidad de Oviedo 33006 Oviedo Spain . Station de Recherches de Pathologic comparée F 30380 Saint-Christol Summary The D. simulans SimES strain is characterized by the presence of individuals of S-phenotype malformation and or suppression of thoracic bristles mainly the dorsocentral and scutellar ones with a variable frequency ranging approximately from 50 p. 100 to-60 p. 100. Since this phenotype is transmitted maternally the presence of a microorganism responsible for that phenotype can be suspected. The presence of 2 pathogenic microorganisms in the SimES strain a microsporidia Nosema kingi and a Picornavirus Drosophila c virus was detected. In flies free of both microorganisms the s phenotype maintains the same properties and therefore it can be concluded that they play no part in the s phenotype determination However several experimental results . effects of temperature infectious action of SimES extracts and no effect of antibiotics have led US to formulate the hypothesis that s phenotype is due to-action of slightly pathogenic virus transovarially transmitted. Key words Endemic microorganisms Drosophila simulans SimES non-mendelian character hereditary virus pathology of morphogenesis. Résumé Micro-organismes endémiques d une souche de Drosophila simulans et lettrs relations avec la transmission non-mendélienne d ltn caractềre La souche SimES de Drosophila simulans se caractérise par la presence d individus de phenotype s malformations et ou suppression de soies thoraciques principalement des. dorso-centrales et des scutellaires avec une frequence de 50 ậ 6Ộ p. 100. Ce phenotype est transmis maternellement .