Abstract

A study was made of some late reactions in the trisporic acid biosynthetic pathway in Mucor mucedo. Trisporic acids induce sexual reproduction in several Mucorales. Two enzymes involved in these reactions, a NADP-dependent dehydrogenase and an esterase, appeared to be highly specific for the minus mating type. The synthesis of these enzymes is stimulated by trisporic acids, indicating a positive control of these hormones upon their own synthesis. The dehydrogenase was histochemically shown to be concentrated in the zygophores of Mucor mucedominus. In the homothallic Zygorhynchus moelleri the copulating main branch (which is known to have a minus character) appeared to be the major site of dehydrogenase activity.

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