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Separate plus and minus cultures ofBlakeslea trispora synthesize small amounts of trisporic acids under specific conditions. These amounts are expressed as a percentage of the trisporic acids (50 mg/liter of medium) synthesized by mixed plus-minus cultures in 5 days. Plus cultures, without additives from minus cultures, synthesize 0.1% trisporic acids. Plus cultures synthesize 0.4% trisporic acids when stimulated by M-factor, a mating-type-specific component synthesized by minus cultures. Minus cultures, without additives from plus cultures, do not synthesize even 0.0001% trisporic acids. Minus cultures synthesize 1% trisporic acids when stimulated by P-factor, a mating-type-specific component synthesized by plus cultures. Minus cultures synthesize M-factor when stimulated by π, a component synthesized by plus cultures. We speculate that (i) minus cultures synthesize a component, μ, which stimulates P-factor synthesis in plus cultures, and (ii) both M-factor and P-factor are precursors of trisporic acids.

journal of bacteriology

Trisporic Acid Biosynthesis in Separate Plus and Minus Cultures of <i>Blakeslea trispora</i> : Identification by <i>Mucor</i> Assay of Two Mating-Type-Specific Components

Trisporic Acid Biosynthesis in Separate Plus and Minus Cultures of Blakeslea trispora : Identification by Mucor Assay of Two Mating-Type-Specific Components