Abstract
The mating interaction between strains of heterothallic Mucor pusillus of the (+) mating type and a strain of the (−) mating type derived from one of the (+) by mutagenic treatment is shown to depend upon the same hormone system as has been investigated in other Mucorales, based upon the cooperative formation of the trisporic acids. Both the (+) and the derived (−) strains are shown to give “imperfect” mating reactions with test strains, (−) and (+), respectively, of Mucor mucedo , and trisporic acid production is demonstrated in mixed cultures of the (+) and the derived (−) strains of M. pusillus but not in either strain alone.
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