MSA - Systematics/Evolution
Pekarek, Elizabeth , Vilgalys, Rytas .
Multiple-species sexual compatibility and the role of reinforcement in Pleurotus pulmonarius from New Zealand.
Understanding of the genetic mechanisms of speciation is hindered by our inability to cross good biological species and produce fertile offspring. Exceptions to this rule provide a useful tool in aiding our knowledge of how species form reproductive barriers. To this end, I have characterized a collection of Pleurotus pulmonarius from New Zealand (NZP) that shows mating compatibility with three other well documented biological species of Pleurotus. I report here that the NZP strain appears to have completely lost the prezygotic isolating barriers reported in P. pulmonarius strains from Europe, Asia, and North America. Postzygotic isolation, in the form of inviable and infertile offspring, is incomplete, but remains a strong factor for these interspecies hybrids. This dichotomy between pre- and postzygotic isolation along with the biogeography of the species involved, suggests a reversal of the effects of reinforcement on this isolated New Zealand strain.
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1 - Duke University, Department of Biology, 139 Biological Sciences Building, PO Box 90338, Durham, North Carolina, 27708, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Cottonwood D/Snowbird Center
Date: Monday, July 27th, 2009
Time: 4:00 PM