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Applied and Environmental Microbiology, August 1998, p. 2988-2994, Vol. 64, No. 8
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Genetics of Vegetative Incompatibility in Cryphonectria parasitica

Paolo Cortesi1,* and Michael G. Milgroom2

Istituto di Patologia Vegetale, Università degli Studi di Milano, Milan, Italy,1 and Department of Plant Pathology, Cornell University, Ithaca, New York2

Received 30 March 1998/Accepted 12 June 1998

Vegetative incompatibility in the chestnut blight fungus, Cryphonectria parasitica, in Europe is controlled by six unlinked vic loci, each with two alleles. Four previously identified vic loci (vic1, vic2, vic3, and vic4) were polymorphic in European vegetative compatibility (vc) types. Two new loci, vic6 and vic7, also were identified among European vc types. In one cross, vic genes segregated independently at five loci, and 194 progeny were assigned to 32 vc types; none of these loci were linked. A total of 64 vc types were identified from all crosses. All 64 genotypes possible from six vic loci, each with two alleles (26 = 64), were identified and assigned to vc types. Based on our model, vc types v-c 5 and v-c 10, which had been used in previous genetic studies, differ by only five vic genes. Future studies of vc types in C. parasitica can use knowledge of vic genotypes for analysis of population genetic structure based on vic allele frequencies and to determine the effect of each vic gene on virus transmission between vc types.

* Corresponding author. Mailing address: Istituto di Patologia Vegetale, Università degli Studi di Milano, Via Celoria 2, 20133 Milan, Italy. Phone: 39-02-2369-1128. Fax: 39-02-7063-1287. E-mail: pcortesi{at}imiucca.csi.unimi.it.

Applied and Environmental Microbiology, August 1998, p. 2988-2994, Vol. 64, No. 8
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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