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1 September 2008 Fungal Viral Mutualism Moderated by Ploidy
Robert McBride, Duncan Greig, Michael Travisano
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Abstract

Endosymbionts and their hosts have inherently ambiguous relationships as symbionts typically depend upon their hosts for shelter, nutrition, and reproduction. Endosymbionts can acquire these needs by two alternative strategies: exploitation and cooperation. Parasites exploit hosts to advance their own reproduction at the cost of host fitness. In contrast, mutualists increase their reproductive output by increasing host fitness. Very often the distinction between parasites and mutualists is not discrete but rather contingent on the environment in which the interaction occurs, and can shift along a continuous scale from parasitism to mutualism. The cost benefit dynamics at any point along this continuum are of particular interest as they establish the likelihood of an interaction persisting or breaking down. Here we show how the interaction between the yeast Saccharomyces cerevisiae and an endosymbiotic killer virus is strongly dependent on both host ploidy and environmental pH. Additionally we elucidate the mechanisms underlying the ploidy-dependent interaction. Understanding these dynamics in the short-term is key to understanding how genetic and environmental factors impact community diversity.

Robert McBride, Duncan Greig, and Michael Travisano "Fungal Viral Mutualism Moderated by Ploidy," Evolution 62(9), 2372-2380, (1 September 2008). https://doi.org/10.1111/j.1558-5646.2008.00443.x
Received: 27 November 2007; Accepted: 6 May 2008; Published: 1 September 2008
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