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A genetic map of Phycomyces blakesleeanus

✍ Scribed by Orejas, Margarita ;Peláez, Maria Isabel ;Alvarez, Maria Isabel ;Eslava, Arturo P.

Publisher
Springer
Year
1987
Tongue
English
Weight
760 KB
Volume
210
Category
Article
ISSN
0026-8925

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✦ Synopsis

Complementation tests among Phycomyces auxotrophic strains revealed the existence of four genes with mutants requiring riboflavin, three genes with purine auxotrophs, two with nicotinic acid auxotrophs, and two with lysine auxotrophs. A total of 134 sexual crosses between strains carrying mutations affecting phototropism (madA-madE), carotenoid biosynthesis (carA), auxotrophy (ribA-ribD, purA-purC, lysA and lysB, nicA and nicB, and leuA) and resistance to 5-fluorouracil (furA and furB) were studied; mating type (sex) was also included as a marker. The results from random spore analysis, tetrad analysis, and gene-centromere distances shows that these markers are distributed into 11 linkage groups.

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Mutants resistant to nikkomycin, an inhibitor of chitin biosynthesis, were isolated after exposure of wild-type spores of the fungus Phycomyces blakesleeanus to N-methyl-N'-nitro-N-nitrosoguanidine. Genetic analysis revealed that nikkomycin resistance was due to mutations in a single gene, chsA. Mut