Abstract
Effects of conidiation, light, and oxygen on the biosynthesis of carotenoids in Neurospora crassa were studied. On special media, conidiation could be enhanced or suppressed. Submerged cultures, grown on liquid medium with the addition of Tween 80 never produced conidia. These cultures remained colorless and pigmentation started only after exposure to light and oxygen. The time curve of carotenoid production was given. Illumination as short as 1s min. stimulated production of full color but was effective only in the presence of sufficient oxygen. Further synthesis sould occur in the dark, but not under anaerobic conditions. The study of the appearance of the different carotenoids after exposure to light and oxygen showed the independent formation of different pigments. The disappearance of phytoene was followed by the appearance of the acidic pigment which indicated that the latter was formed from the former. The conidia produced more carotenoids, and in different proportions, than the mycelium. No increase of pigmentation was noted when different possible precursors of carotenoids were fed to Neurospora.
Published Version
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