Rousset F, de Stordeur E
Laboratoire de Biologie et Génétique Evolutives, CNRS, Gif sur Yvette, France.
Heredity (Edinb). 1994 Apr;72 ( Pt 4):325-31. doi: 10.1038/hdy.1994.48.
Maternally inherited bacteria of the genus Wolbachia are responsible for reproductive incompatibilities between strains of Drosophila simulans. Such incompatibilities are known in several types of crosses, including both directions of crossing between two types of infected strains, 'R' and 'S'. To determine whether the bidirectional incompatibility between R and S flies is due only to differences between their bacteria, flies from an uninfected strain have been experimentally infected with bacteria associated with each type. The incompatibility properties of experimental strains are close to those of original strains harbouring the same bacteria and therefore independent of nuclear background. Backcross experiments, however, show that the infection level of a strain depends on the nature of paternal ancestors. This is not explained by nuclear effects but is possibly the result of an interaction between the infection levels of both parents, in which the infection level of S strains is an equilibrium between a tendency for females to produce weakly infected offspring and selection of more infected eggs by sperm from infected males.
沃尔巴克氏体属（Wolbachia）的母系遗传细菌导致了拟暗果蝇（Drosophila simulans）品系之间的生殖不相容性。这种不相容性在几种杂交类型中都有发现，包括两种感染类型“R”和“S”之间的双向杂交。为了确定R和S果蝇之间的双向不相容性是否仅归因于它们所携带细菌的差异，来自未感染品系的果蝇已被实验性地感染了与每种类型相关的细菌。实验品系的不相容特性与携带相同细菌的原始品系相近，因此与核背景无关。然而，回交实验表明，一个品系的感染水平取决于父系祖先的性质。这并非由核效应所解释，而可能是双亲感染水平之间相互作用的结果，其中S品系的感染水平是雌性产生感染较弱后代的倾向与感染雄性精子选择更多感染卵子之间的一种平衡。
