Abstract
Heterokaryons of Mucor racemosus were produced by fusion of spheroplasts from two auxotrophic strains of the fungus. Germinated sporangiospores were converted to spheroplasts by using commercial chitinase and Myxobacter AL-1 chitosanase. Spheroplasts from the auxotrophic strains were mixed in a buffered Ca(NO3)2 solution and fusion occurred. After cell wall regeneration, prototrophs were isolated. The frequency of heterokaryon formation was 1.45 X 10(-4). Prototrophic isolates segregated parental nuclei at a high frequency, indicating that heterokaryons had formed.
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