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1 July 2002 WITHIN- AND BETWEEN-POPULATION VARIATION FOR WOLBACHIA-INDUCED REPRODUCTIVE INCOMPATIBILITY IN A HAPLODIPLOID MITE
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Abstract

Wolbachia pipientis is a bacterium that induces cytoplasmic incompatibility (CI), the phenomenon in which infected males are reproductively incompatible with uninfected females. CI spreads in a population of hosts because it reduces the fitness of uninfected females relative to infected females. CI encompasses two steps: modification (mod) of sperm of infected males and rescuing (resc) of these chromosomes by Wolbachia in the egg. Infections associated with CI have mod resc phenotypes. However, modresc phenotypes also exist; these do not result in CI. Assuming mod/resc phenotypes are properties of the symbiont, theory predicts that modresc infections can only spread in a host population where a mod resc infection already occurs. A modresc infection spreads if the cost it imposes on the infected females is lower than the cost inflicted by the resident (mod resc ) infection. Furthermore, introduction of a mod Wolbachia eventually drives infection to extinction. The uninfected population that results can be recolonized by a CI-causing Wolbachia. Here, we investigated whether variability for induction of CI was present in two Tetranychus urticae populations. In one population all isofemale lines tested were mod. In the other, mod resc and modresc isofemale lines coexisted. We found no evidence for a cost difference to females expressing either type (mod /). Infections in the two populations could not be distinguished based on sequences of two Wolbachia genes. We consider the possibility that mod is a host effect through a population dynamics model. A mod host allele leads to infection extinction in the absence of fecundity differences. Furthermore, the uninfected population that results is immune to reestablishment of the (same) CI-causing Wolbachia.

F. Vala, A. Weeks, D. Claessen, J. A J. Breeuwer, and M. W. Sabelis "WITHIN- AND BETWEEN-POPULATION VARIATION FOR WOLBACHIA-INDUCED REPRODUCTIVE INCOMPATIBILITY IN A HAPLODIPLOID MITE," Evolution 56(7), 1331-1339, (1 July 2002). https://doi.org/10.1554/0014-3820(2002)056[1331:WABPVF]2.0.CO;2
Received: 13 August 2001; Accepted: 11 March 2002; Published: 1 July 2002
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