Mutations et altérations dans la transmission des informations génétiques chez la drosophile par injection d'extraits de chrysalides diapausantes (pieris brassicae) traitées par des ptérines II. Variations dans l'expression des gènes par addition d'hormones de croissance au traitement

Injection into Drosophila larvae of extracts of Pierides and mutants of Drosophila treated by reduced folic acid and pterins always produce juvenilising effects. The hypothesis is therefore suggested that juvenile hormone is released either in the chrysalids or in the injected Drosophila larvae. The addition of juvenile hormone to the injection mixture leads to the killing of pupae and imaginal discs hypertrophied by interstitial liquid or undifferentiated cells in F₂ progeny, which supports the above hypothesis. Addition of cyclic AMP gives the same results but the lethal pupae occur at a slightly later stage; imaginal discs are partially developed, leading to imperfectly developed limbs.