Trisporoids under the stimulation of carotenogenesis in Blakeslea trispora

The patterns of trisporoid synthesis in joint cultivation of Blakeslea trispora mates have been studied. The pair of the not-zygospore-forming carotenoid overproducer strains T(+) and T(?) was found to synthesize a large amount of trisporoids, which did not differ in biological activity from those in the wild type strains. While the ??-carotene synthesis stimulator ??-ionone increased the amount of trisporoids, the share of trisporic acids in their composition decreased considerably. The lycopene synthesis stimulator 2-amino-6-methylpyridine caused a decrease in the content of trisporoid which had no trisporic acids in their composition. Emergence of a new substance with the maximum absorption at 250 nm, which accounted for up to 45% of the sum of trisporoids, was a general regularity in the action of both stimulators. The combined action of these two effectors resulted in additional stimulation of lycopene synthesis and was accompanied by the disappearance of trisporic acids. The aggregate findings indicate that both carotenogenesis stimulators inhibit the synthesis of trisporic acids, i.e., their action is not mediated by stimulation of trisporoid synthesis.