Phylogenetic status of a fecundity‐enhancing Wolbachia that does not induce thelytoky in Trichogramma
Phylogenetic status of a fecundity‐enhancing Wolbachia that does not induce thelytoky in Trichogramma
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DOI：
10.1046/j.1365-2583.1999.810067.x
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发表时间：
1999-02
影响因子：
2.6
通讯作者：
F. Vavre;C. Girin;M. Boulétreau
中科院分区：
文献类型：
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作者：
F. Vavre;C. Girin;M. Boulétreau
沃尔巴克氏体是一种广泛分布的细菌，可以感染许多昆虫和其他节肢动物。它们操纵宿主的繁殖以达到自己的目的。在赤眼蜂属中，所有已知的Wolbachia都能诱导雌配子体受精，并在Wolbachia的B亚群中形成一个单系群。在这里，我们表明，一些菌株的寄生虫种赤眼蜂bourarachae港口沃尔巴克氏体共生体，位于A细分，并不诱导thelytoky。虽然T.在其它昆虫中，感染的菌株与Wolbachia密切相关，诱导细胞质不亲和，但在涉及感染和未感染菌株的杂交中未发现细胞质不亲和。于T.在Bourarachae中，这种沃尔巴克氏体的存在与菌株的较高繁殖力相关。我们的研究结果强烈表明，沃尔巴克氏体参与了这一增加的繁殖力。关于宿主-沃尔巴克氏体相互作用进化的理论模型预测，如果感染成本降低，则可以选择降低对繁殖的影响。T.布拉拉查可以说明这一预测。
Wolbachia are widespread bacteria which infect a number of species of insects and other arthropods. They manipulate the reproduction of their hosts at their own advantage. In Trichogramma species all Wolbachia known so far induce thelytoky and form a monophyletic group in the B subdivision of Wolbachia. Here we show that some strains of the arrhenotokous species Trichogramma bourarachae harbour Wolbachia symbionts that locate in the A subdivision, and which do not induce thelytoky. Although the symbiont of T. bourarachae is closely related to Wolbachia that induce cytoplasmic incompatibility in other insects, no cytoplasmic incompatibilities were found in crosses involving infected and uninfected strains. In T. bourarachae the presence of this Wolbachia is associated with a higher fecundity of strains. Our results strongly suggest that Wolbachia are involved in this increased fecundity. Theoretical models on the evolution of host‐Wolbachia interaction predict that a reduced effect on reproduction can be selected for if cost of infection is reduced. The effect in T. bourarachae should illustrate this prediction.