NDLI: Analysis of population structure of the chestnut blight fungus based on vegetative incompatibility genotypes

Content Provider	PubMed Central
Author	Milgroom, Michael G. Cortesi, Paolo
Copyright Year	1999
Abstract	Vegetative incompatibility is a self/nonself-recognition system in fungi that has often been used for describing phenotypic diversity in fungal populations. A common hypothesis is that vegetative incompatibility polymorphisms are maintained by balancing selection. However, understanding the evolutionary significance of vegetative incompatibility and the factors that maintain these polymorphisms has been limited by a lack of knowledge of the underlying genetics of vegetative compatibility (vc) types. Genotypes of 64 vc types, controlled by six unlinked vegetative incompatibility (vic) loci, have been identified in the chestnut blight fungus, Cryphonectria parasitica. By interpreting vc type survey data in terms of vic genotypes, we estimated vic-allele frequencies and analyzed the multilocus genetic structure of 13 populations in Europe and 3 populations in the U.S. European populations have less vc type diversity than the US populations because of a combination of lower vic-allele diversity and limited recombination. Genotypic diversity of 10 populations in Italy correlated to the abundance of sexual structures; however, significant deviations from random mating suggest that either sexual reproduction may not contribute many offspring in these populations or that vic genes (or vic genotypes) are under selection. Most vic-allele frequencies deviated from 0.5, the equilibrium frequency predicted under frequency-dependent selection, providing no evidence for selection acting on these loci.
Starting Page	10518
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	18
Volume Number	96
Language	English
Publisher	The National Academy of Sciences
Publisher Date	1999-08-31
Access Restriction	Open
Rights Holder	The National Academy of Sciences
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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