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Appl Environ Microbiol, June 1998, p. 2094-2095, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Female Fertility and Mating Type Distribution in a South African Population of Fusarium subglutinans f. sp. pinidagger

H. Britz,1,* M. J. Wingfield,1,Dagger T. A. Coutinho,1,Dagger W. F. O. Marasas,2 and J. F. Leslie3

Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein 9300,1 and PROMEC, Medical Research Council, Tygerberg 7505,2 South Africa, and Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506-55023

Received 12 January 1998/Accepted 23 March 1998

Fusarium subglutinans f. sp. pini is the causal agent of pitch canker disease of pines. The initial occurrence of F. subglutinans f. sp. pini in South Africa was limited to a single nursery, and isolates from this population are capable of reproducing sexually. We determined the effective population number, Ne, of this population by using mating type and male/hermaphrodite polymorphisms as indicators. The effective population number for mating type, Ne(mt), is 99% of the count (total population), and that for male/hermaphrodite status, Ne(f), is 42 to 46% of the count (total population). The number of strains that can function as the female parent limits the effective population number of this population. If this population is stable, then, depending upon assumptions about mutation and selection, sexual reproduction need occur only once per 26 to 153 asexual generations to maintain this level of sexual fertility.

* Corresponding author. Present address: Forestry and Agricultural Biotechnology Institute, Faculty of Biological and Agricultural Sciences, University of Pretoria, Pretoria 0002, South Africa. E-mail: hbritz{at}scientia.up.ac.za.

dagger Contribution no. 98-257-J of the Kansas Agricultural Experiment Station, Manhattan.

Dagger Present address: Forest and Agricultural Biotechnology Institute, Faculty of Biological and Agricultural Sciences, University of Pretoria, Pretoria 0002, South Africa.

Appl Environ Microbiol, June 1998, p. 2094-2095, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

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