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Copyright 2004 by the Genetics Society of America DOI: 10.1534/genetics.104.027235
 

Summary: Copyright 2004 by the Genetics Society of America
DOI: 10.1534/genetics.104.027235
Dikaryons of the Basidiomycete Fungus Schizophyllum commune:
Evolution in Long-Term Culture
Travis A. Clark1
and James B. Anderson
Department of Botany, University of Toronto, Mississauga, Ontario L5L 1C6, Canada
Manuscript received February 11, 2004
Accepted for publication May 7, 2004
ABSTRACT
The impact of ploidy on adaptation is a central issue in evolutionary biology. While many eukaryotic
organisms exist as diploids, with two sets of gametic genomes residing in the same nucleus, most basidiomy-
cete fungi exist as dikaryons in which the two genomes exist in separate nuclei that are physically paired
and that divide in a coordinated manner during hyphal extension. To determine if haploid monokaryotic
and dikaryotic mycelia adapt to novel environments under natural selection, we serially transferred replicate
populations of each ploidy state on minimal medium for 18 months ( 13,000 generations). Dikaryotic
mycelia responded to selection with increases in growth rate, while haploid monokaryotic mycelia did
not. To determine if the haploid components of the dikaryon adapt reciprocally to one another's presence
over time, we recovered the intact haploid components of dikaryotic mycelia at different time points
(without meiosis) and mated them with nuclei of different evolutionary histories. We found evidence for

  

Source: Anderson, James B. - Department of Ecology and Evolutionary Biology, University of Toronto

 

Collections: Environmental Sciences and Ecology