Genetics of Gibberella fujikuroi. IV. Natural occurrence of compatibility alleles at the mating locus

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Abstract
G. fujikuroi is a heterohallic bipolar fungus and both mat+ and mat- types are found in nature but, they rarely cross under natural conditions. However, mat+ and mat- field isolates cross with the 2 tester strains under laboratory conditions and show variable degrees of sexual compatibility as measured in terms of number of fertile perithecia. Fifteen mat+ and 15 mat- field isolates were crossed with the 2 tester strains. Variable degrees of compatibility, ranging 2.2-47.7 perithecia when crossed with 223 mat- and 1.1-39.9 perithecia when crossed with 80 mat+, were obtained. The genetic control of 6 easily distinguishable degrees of compatibility were studied from test crosses made with the tester strains using random and unordered tetrad analyses. Three alleles in mat+ and 3 alleles in mat- were distinguished. Frequency of natural occurrence of mat+ and mat- was 27 and 73%, respectively.

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