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Regulation of Wolbachia Density in the Mediterranean Flour Moth, Ephestia kuehniella, and the Almond Moth, Cadra cautella

Abstract The Mediterranean flour moth, Ephestia kuehniella, is infected with A-group Wolbachia (wKue), and the almond moth, Cadra cautella, is doubly infected with A- and B-group Wolbachia, which are designated as wCauA and wCauB, respectively. In both insects, the Wolbachia populations increased greatly during embryonic and larval stages. The Wolbachia population doubled every 3.6 days on average in E. kuehniella larvae, whereas those of wCauA and wCauB doubled every 2.1 days in C. cautella larvae. The populations of wCauA and wCauB that had been transferred into the E. kuehniella background increased at similar rates to that of wKue in the natural host E. kuehniella, suggesting that the host genetic background influences Wolbachia proliferation. To examine whether the populations of the two Wolbachia variants in double infection is regulated collectively or independently, we measured the infection load in the ovaries of three transfected E. kuehniella lines in different infection states: single infection with wCauA, single infection with wCauB, and double infection. The density of each Wolbachia variant did not differ significantly between the singly and doubly transfected hosts, suggesting independent regulation.