Abstract
Endosymbiotic bacteria belonging to the genus Wolbachia are maternally inherited and can cause various effects on the reproductive system of their invertebrate hosts. Owing to their critical effects on insect reproduction, Wolbachia are potential tools for future insect pest control strategies. Here, we explored Wolbachia infections among stock collections at the National Food Research Institute of Japan, where stored-product insect pests and their parasitoids are maintained. Diagnostic polymerase chain reactions (PCRs) and sequencing of a fragment of the Wolbachia surface protein ( wsp) gene revealed that, among 59 strains (38 species) belonging to the Coleoptera, Psocoptera, Lepidoptera and Hymenoptera, 18 strains (13 species) were infected with Wolbachia. Among them, 14 strains of Wolbachia were identified based on wsp gene sequences. Database searches showed that at least 6 Wolbachia strains were shared by multiple host species. Co-infections with two distinct Wolbachia strains were found in the drugstore beetle Stegobium paniceum and Angoumois grain moth Sitotroga cerealella. Detection and characterization of Wolbachia strains from these pests and their parasitoids provide us with basic information for future pest control strategies using these endosymbiotic bacteria.
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