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The Japanese ladybirds, Coccinula crotchi and Coccinula sinensis, are infected with very closely related strains of male-killing Flavobacterium

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Insect Science 2014年第6期21卷 699-706页

作者： Sherif Elnagdy susan messing Michael E. N. Majerus Department of Genetics University of Cambridge Downing Street Cambridge CB2 3EH UK Botany Department Faculty of Science Cairo University Giza Egypt University of Rochester Rochester New York USA Department of Biostatistics and Computational Biology University of Rochester Rochester New York USA

Male-killing is 1 of 4 known strategies that inherited parasitic endosymbionts have evolved to manipulate their host＇s reproduction. In early male-killing, infected male offspring are killed early in embryogenesis. Within the Insecta, male-killing bacteria have been found in a wide range of hosts. The Coccinellidae families of beetles, better known as ladybirds, are particularly prone to male-killer invasion. In samples of the coccinellid, Coc- cinula crotchi, from Japan, a new male-killing bacterium was revealed by phenotypic assay. Molecular genetic analysis revealed the identity to be a tetracycline-sensitive Flavobac- terium that causes female-biased offspring sex ratio. Furthermore, that Flavobacterium strain was found to be closely related to the Flavobacterium causing male-killing in the congeneric Japanese coccinellid, Coccinula sinensis, which was collected from the same region. However, we found slightly different Flavobacterium strains infecting C. sinen- sis from regions with different environmental conditions. This may be an indication of horizontal transmission of male-killing Flavobacterium between these 2 ladybird spices. Finally, environmental conditions may affect the spread of male-killing bacteria among their hosts.

关键词： Coccinula crotchi Coccinula sinensis endosymbionts Flavobacterium inherited bacteria male-killing sex ratio distorter

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