title: A single sex-linked dominant gene does not fully explain the codling moth's resistance to granulovirus.
abstract: BACKGROUND
  In 2004, resistance to a commercial formulation of the Cydia pomonella granulovirus (CpGV) was identified in a field population of Cydia pomonella from an organic orchard in southern France. The genetic inheritance of this resistance was analysed in the resistant laboratory strain RGV. This strain was obtained using successive crosses between the resistant field population and a susceptible laboratory strain, SV, with selection for CpGV resistance at each generation.
  
  
  RESULTS
  After eight generations of introgression of the resistant trait into SV, the RGV-8 strain exhibited 7000-fold higher resistance than SV. Mass-crossing experiments showed that resistance to CpGV is strongly dominant, sex dependent and under the control of a single major gene. However, the contribution of other genes is required to explain all of the data obtained in this study. These additional genes do not follow the laws of classical Mendelian transmission.
  
  
  CONCLUSIONS
  Transmission of granulovirus resistance in the RGV-8 strain of C. pomonella cannot be fully explained by the effect of a locus located on the Z chromosome. The action of other factors needs to be considered.
authors.affiliation: EMA, Centre LGEI, Ales, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Berling
authors.forename: Benoît
authors.initials: B
authors.lastname: Sauphanor
authors.forename: Antoine
authors.initials: A
authors.lastname: Bonhomme
authors.forename: Myriam
authors.initials: M
authors.lastname: Siegwart
authors.forename: Miguel
authors.initials: M
authors.lastname: Lopez-Ferber
mesh_terms: D000818:Animals; D005260:Female; D005799:Genes, Dominant; D025722:Granulovirus / Q000502:physiology*; D019476:Insect Proteins / Q000235:genetics* / Q000276:immunology; D008297:Male; D009036:Moths / Q000235:genetics* / Q000276:immunology / Q000821:virology*; D010572:Pest Control, Biological; D012737:Sex Factors
chemical_list: D019476:Insect Proteins
keywords: CpGV; Cydia pomonella granulovirus; codling moth; inheritance; resistance; sex linkage