5-氟尿嘧啶对家蝇卵巢的影响及其诱变效应

5—氟尿嘧啶(5-FU)是家蝇的有效不育性药剂.采用饲食法用浓度0.5%处理家蝇成虫一天,能造成家蝇90%以上不育,连续处理4—5天,即可造成完全不育.但处理雄蝇×正常雌蝇表现无效.其次,处理后的卵巢形态及细胞学变化显示:处理后的卵巢第一天比对照体积有增加,以后则发育迟缓、卵巢的外形和颜色也有改变.处理后的卵原区首先发生破坏,第一卵室的变化最明显,第二、第三卵室畸形或不发育.滤泡细胞和营养细胞改变很大,卵母细胞相对地改变较小.处理家蝇的后代表现出突变和畸形现象.讨论了5—FU的作用机制.由药效测定和细胞病理改变提出了5—FU造成家蝇不育的可能作用方式.

EFFECT OF 5-FLUOROURACIL ON OVARIAN DEVELOPMENT OF THE HOUSEFLY AND THE INDUCTION OF MUTATION

The effect of 5-fluorouracil on the ovarian development of the common housefly, Musca domestica vicina, is investigated and the histological changes caused in the ovaries at different stages are examined. The most important effect occurs in the germarium, in the egg chamber the follicular cells change first, then the nutritive cells, and the oocytes are usually least affected. Several mutations were noticed in the course of the experiment. The possible mode of action of 5-fluorouracil on the housefly ovary is discussed.