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HYBRID DYSGENESIS IN DROSOPHILA MELANOGASTER: MORPHOLOGICAL AND CYTOLOGICAL STUDIES OF OVARIAN DYSGENESIS
Ruth E. Schaefer 1, Margaret G. Kidwell 1, and Anne Fausto-Sterling 1
1 Division of Biology and Medicine, Brown University, Providence, Rhode Island 02912
A type of intraspecific hybrid sterility, between two strains of Drosophila melanogaster, referred to as GD (gonadal dysgenesis) sterility, is observed when females from a type of strain called M are crossed with males from a second type called P. Absence of egg-laying is characteristic of female GD sterility and its manifestation is conditional on high developmental temperatures. Morphological and cytological studies of GD sterile females are described. These individuals were normal in body size and external appearance. No defects in sperm storage were observed. Both adult and larval ovaries were drastically reduced in size in comparison with control ovaries. This ovarian dysgenesis was sometimes unilateral, but more frequently it was bilateral, particularly in females developing at the highest test temperature. The ovarioles of dysgenic ovaries contained no vitellaria; the germaria lacked any cells resembling the cystocyte clusters of normal ovaries. It is concluded that sterility results from an early blockage in ovarian development, rather than from atrophy of previously developed structures. Possible mechanisms for this developmental arrest are discussed.
Submitted on October 17, 1978Revised on March 13, 1979
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