Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: The genetic control of ovariole in Sitophilus oryzae L is temperature sensitive | Genet Sei Evol 1994 26 413-430 Elsevier 1NRA 413 Original article The genetic control of ovariole number _ in Sitophilus oryzae L Coleoptera Curculionidae is temperature sensitive AM Grenier p Nardon INSA UA INRA 227 Laboratoire de Biologie Appliquée Bât 406 20 avenue A-Einstein 69621 Villeurbanne cedex France Received 3 May 1993 accepted 29 April 1994 Summary - The influence of genetical and epigenetical factors on the determinism of the ovariole number was studied in Sitophilus oryzae. This weevil normally possesses 4 ovarioles with apical bacteriomes harbouring symbiotes. By selecting females with a reduced number of ovarioles the genetic control of this trait was demonstrated with regard to the easy selection of this character and its similar transmission to the progeny by females and males. Several genes could be implicated and a weak maternal effect cannot be rejected. The character is temperature sensitive at 30 C abnormal females with 2 or 3 ovarioles prevail and conversely normal females appear at 20 C. The reduction of the number of ovarioles is correlated with a decrease in fitness reduced progeny and lighter body weight of females . Only ovary formation seems to be affected because a higher progeny per ovariole in abnormal females can be indicative of a normal yolk production in the fat body. Counting bacteria in ovaries shows that the regulation of symbiote number per female occurs at the ovariole itself and not within the whole insect. Sitophilus oryzae I ovariole number selection genetic control temperaturesensitive character Resume Le contrôle génétique du nombre des ovarioles chez Sitophilus oryzae L Coleoptera Curculionidae est sensible à la temperature. L influence de facteurs génétiques et épigénétiques sur le déterminisme du nombre des ovarioles a été étudiée chez Sitophilus oryzae. Ce charanqon possède normalement 4 ovarioles terminés par un bactériome apical hébergeant des symbiotes. En sélectionnant les femelles ayant un nombre réduit d .
