Tuesday, December 12, 2006 - 4:47 PM
0886

The mechanism of parthenogenesis-induction by the bacterial endosymbiont Cardinium suggests independent origins from Wolbachia

Martha S. Hunter, mhunter@ag.arizona.edu1, Suzanne E. Kelly, suekelly@ag.arizona.edu1, Massimo Giorgini, giorgini@ipp.cnr.it2, and Steve J. Perlman, stevep@uvic.ca3. (1) University of Arizona, Department of Entomology, 410 Forbes Building, Tucson, AZ, (2) Consiglio Nazionale delle Ricerche, Istituto per la Protezione delle Piante - Sezione di Portici, via Università, 133, Portici (NA), Italy, (3) University of Victoria, Department of Biology, PO Box 3020, Stn CSC, Victoria, B.C, Canada

Cardinium is a symbiont lineage in the Bacteroidetes, distantly related to Wolbachia, an Alphaproteobacteria, in which multiple host reproductive manipulations have been discovered. In particular, Cardinium shares the reproductive manipulation phenotypes of parthenogenesis-induction (PI), cytoplasmic incompatibility, and feminization with Wolbachia. An open question is whether the functional similarities between these bacteria are due to convergence, or to lateral gene transfer of manipulation genes across these divergent taxa. We present data that suggests PI Cardinium is functionally different from PI Wolbachia. PI induction is generally restricted to haplodiploid systems, in which infected, incipient haploid (male) eggs are restored to diploidy, and develop as females. Diploidy restoration in PI Cardinium-infected Encarsia pergandiella appears to occur in meiosis, rather than in one of the first two mitotic divisions, as has been observed in hosts of PI Wolbachia.


Species 1: Hymenoptera Aphelinidae Encarsia pergandiella

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