Drosophila melanogaster 의 Hybrid Dysgenesis 에 관한 硏究 : Ⅲ. P-M System에 의한 Gonadal Dysgenic Sterility = Hybrid Dysgenesis in Drosophila melanogaster: Ⅲ. Sterility Resulting from Gonadal Dysgenesis in the P-M System

다국어 초록 (Multilingual Abstract)

Hybrid dysgenesis is a condition found in certain interstrain hybrid of Drosophila melanogaster caused by the interaction of chromosomal and cytoplasmic factors. Present study was carried out by the characteristics of the GD(gonadal dysgenesis)sterility associated with P-M system and its temperature dependence.
Female sterility was accompanied by a complete absence of egg-laying. Dysgenic ovaries were generally reduced in size in comparison to control ones. This ovarial dysgenesis was sometimes unilateral, but more frequently it was bilateral, particularly in females developed at the highest test temperature. Some of the sterile males had reproductive tracts that appeared normal, however, most of them had either bilateral or unilateral rudimentary testes in which no sperm could be found. The manifestation of female sterility was highly dependent of F1 developmental temperature: Most of the increasing sterility accompanied by the change from permissive to restrictive temperature occurs over a narrow temperature range of 25℃ to 27℃. However, the high and critical range of precipitous sterility were occur at a rather higher temperature range in male than in females: 27℃ to 29℃. Ovarian size tended to decrease with increasing developmental temperature in all Cross A groups. At 25℃,mean ovarian length of Cross A was slightly reduced compared to that of control groups. At 29℃ all of the Cross A female had ovarian dimensions that were 30% of those of the control groups, with a corresponding reduction in volume.