Genetics and Regulation of Carotene Biosynthesis

Cerdá-Olmedo, E.; Torres-Martínez, S.

doi:10.1016/b978-0-08-022359-9.50016-3

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1985

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“…The white and deep-colored Gibberella mutants resemble similar mutants in Phycomyces spp. (7). Most attractive are the mutants that synthesize neurosporaxathin in the dark but that are similar to the wild type in the light.…”

Section: Discussionmentioning

confidence: 99%

Gibberella fujikuroi mutants obtained with UV radiation and N-methyl-N'-nitro-N-nitrosoguanidine

Ávalos¹,

Casadesús²,

Cerdá‐Olmedo³

1985

Appl Environ Microbiol

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N-methyl-N'-nitro-N-nitrosoguanidine (nitrosoguanidine) and to a lesser extent UV radiation are very mutagenic for Gibberella microconidia. The recommended nitrosoguanidine doses lead to much higher frequencies of mutants than are found in other microorganisms. The frequency of mutants among the survivors increases linearly with the nitrosoguanidine dose (molar concentration X time); the absolute number of viable mutants in a given population reaches a maximum for a dose of ca. 0.7 M X s. The microconidia are uninucleate. The onset of germination brings about increased lethality of nitrosoguanidine, but it does not modify the action of UV radiation. Mycelia are more resistant than spores to both agents. Visible illumination effectively prevents lethality when given immediately after UV radiation. Auxotrophs and color mutants are very easily obtained. Pink adenine auxotrophs and several classes of color mutants are affected in the biosynthesis of the carotenoid pigment, neurosporaxanthin.

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Section: Discussionmentioning

confidence: 99%