Somerson N L, Ehrman L, Kocka J P, Gottlieb F J
Proc Natl Acad Sci U S A. 1984 Jan;81(1):282-5. doi: 10.1073/pnas.81.1.282.
The Drosophila paulistorum complex contains six semispecies that do not normally interbreed. In the laboratory, crosses between semispecies produce fertile daughters and sterile sons. Microbial endosymbionts have been observed in all D. paulistorum flies that display this male sterility. Streptococcal L-forms have been isolated from the Andean-Brazilian (Mesitas) and Transitional (Santa Marta) semispecies and cultured in artificial medium. Transfer of these L-forms from their native hosts into reciprocal semispecies resulted in sterile male progeny. When L-forms were inoculated into the semispecies from which they had been isolated, most of the male progeny were fertile. Control streptococcal L-forms did not show this sterility pattern.
果蝇保罗氏复合种包含六个通常不杂交的半种。在实验室中,半种之间的杂交产生可育的雌性后代和不育的雄性后代。在所有表现出这种雄性不育的保罗氏果蝇中都观察到了微生物内共生体。已从安第斯 - 巴西(梅西塔斯)和过渡型(圣玛尔塔)半种中分离出链球菌L型,并在人工培养基中培养。将这些L型从其原生宿主转移到相互对应的半种中,导致产生不育的雄性后代。当将L型接种到分离出它们的半种中时,大多数雄性后代是可育的。对照链球菌L型没有表现出这种不育模式。