Abstract
We demonstrate the spatial and the developmental pattern of DNA content in the follicular epithelium nuclei in the red cotton bug, Dysdercus intermedius, during the first gonadotropic cycle. The prefollicular tissue is composed of nuclei of different DNA material formed by underreplication of DNA. This disposition of DNA material does not change in the sequel of development of previtellogenic follicles. As yolk is incorporated, the ploidy changes, establishing a new batch of polyploid nuclei by a final underreplication of DNA. These nuclei form the basis for the development of nuclei in the epithelium of vitellogenic follicles. Either they duplicate their genome, forming mononucleate cells or divide into binucleate cells. Yolk incorporation is not dependent on the composition of polyploid nuclei in the follicular epithelium. Precocene-II treatment and juvenile hormone-III application cause no apparent alteration in the ploidy pattern of the previtellogenic follicles. While juvenile hormone exerts no influence upon the epithelium of previtellogenic follicles, it stimulates ploidy changes in vitellogenic follicles. The developmental pattern of juvenile hormone-induced ploidizations indicates a direct mode of action.
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