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Applied and Environmental Microbiology, March 1999, p. 1198-1201, Vol. 65, No. 3
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Fusarium subglutinans f. sp. pini Represents a Distinct Mating Population in the Gibberella fujikuroi Species Complexdagger

H. Britz,1,* T. A. Coutinho,1 M. J. Wingfield,1 W. F. O. Marasas,2 T. R. Gordon,3 and J. F. Leslie4

Forestry and Agricultural Biotechnology Institute, Faculty of Biological and Agricultural Sciences, University of Pretoria, Pretoria, 0002,1 and PROMEC, Medical Research Council, Tygerberg 7505,2 South Africa; Department of Plant Pathology, University of California, Davis, California 956163; and Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506-55024

Received 6 October 1998/Accepted 12 December 1998

Fusarium strains in the Gibberella fujikuroi species complex cause diseases on a variety of economically important plants. One of these diseases, pitch canker of Pinus spp., is caused by strains identified as Fusarium subglutinans f. sp. pini. Fertile crosses were detected between F. subglutinans f. sp. pini strains from South Africa, California, and Florida. F. subglutinans f. sp. pini strains were not cross-fertile with the standard tester strains of six of the seven other mating populations of G. fujikuroi. Sporadic perithecia with ascospores were obtained in two crosses with the mating population B tester strains. These perithecia were homothallic, and the ascospores derived from these perithecia were vegetatively compatible with the mating population B tester strain parent. We concluded that fertile F. subglutinans f. sp. pini isolates represent a new mating population (mating population H) of G. fujikuroi and that they belong to a unique biological species in a distinct taxon.

* Corresponding author. Mailing address: Forestry and Agricultural Biotechnology Institute, Faculty of Biological and Agricultural Sciences, University of Pretoria, Pretoria, 0002, South Africa. Phone: 27-12-420-4111. Fax: 27-12-420-3960. E-mail: Henriette.Britz{at}fabi.up.ac.za.

dagger Contribution no. 99-126-J from the Kansas Agricultural Experiment Station, Manhattan.

Applied and Environmental Microbiology, March 1999, p. 1198-1201, Vol. 65, No. 3
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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