Abstract
Sclerotinia sclerotiorum was found to form stable heterokaryons. Auxotrophic mutants derived from six prototrophic wild-type strains were paired in all combinations on minimal media. Some combinations of auxotrophs led to the development of prototrophic strains. These prototrophic strains were demonstrated to be heterokaryons by separating the two parental nuclear types into separate thalli. Heterokaryon formation was under the control of a regulatory system that resulted in incompatibility in some combinations of strains, but not in others. Each strain was placed into one of three vegetative compatibility groups based on heterokaryon formation with the five other strains. Members belonging to one vegetative compatibility group came from different geographical locations, different hosts and were collected at disparate times. Vegetative compatibility groups did not directly correspond to mycelial compatibility groups.
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