Wild-type Phycomyces blakesleeanus synthesizes the yellow pigment, beta-carotene. Colour mutants exhibit various alterations in the biosynthesis of beta-carotene or in its regulation. The presence of certain chemicals in the medium stimulates carotenogenesis in the wild type. We attribute different
Photoregulation of carotenogenesis inPhycomyces
β Scribed by J. L. Revuelta; A. P. Eslava
- Publisher
- Springer-Verlag
- Year
- 1984
- Tongue
- English
- Weight
- 360 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0172-8083
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β¦ Synopsis
Mutants of Phycomyces defective in carotene regulation were studied in relation with the photo carotenogenic response. Quantitative complementation analyses revealed that carC, carA and carS mutations are recessive and complement for this photoresponse in carC * carA and carC * carS heterokaryons. A scheme of the regulation of carotenogenesis by light is proposed.
π SIMILAR VOLUMES
Genetic analysis of carotenogenesis in Phycomyces is hampered by the inability of most mutants to complete the sexual cycle. Heterokaryons between complementing mutants or between a mutant and a helper strain are, however, fertile. Using this method crosses have been carried out between mutants repr
Blue light stimulates the accumulation of betacarotene (photocarotenogenesis) in the fungus Phycomyces blakesleeanus. To be effective, light must be given during a defined period of development, which immediately precedes the cessation of mycelial growth and the depletion of the glucose supply. The
The mycelium of the fungus Phycomyces, essentially a giant multinucleate cell, produces two kinds of asexual reproductive structures, called macrophores and microphores, and a succession of structures for sexual reproduction. Following the treatment of spores with N-methyl-N'-nitro-N-nitrosoguanidin