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Genetics, Vol 137, 79-85, Copyright © 1994
INVESTIGATIONS |
Enhancers of Conidiation Mutants in Aspergillus nidulans
D. H. Gems and A. J. Clutterbuck
Present address: Molecular Biology Program, 311 Tucker Hall, University of Missouri, Columbia, Missouri 65211.
Mutants at a number of loci, designated sthenyo, have been isolated as enhancers of the oligoconidial mutations at the medA locus. Two loci have been mapped: sthA on linkage group I, and sthB on linkage group V. Two probable alleles have been identified at each locus but two further mutants were unlinked to either sthA or sthB. Neither sthA nor sthB mutants have conspicuous effects on morphology on their own, nor could the sthA1 sthB2 double mutant be distinguished from wild type. Mutants at both loci also interact with the temperature-sensitive brlA42 mutant at the permissive temperature to give a phenotype described as ``Abacoid.'' sthA1 also induces a slight modification of the phenotype of an abaA mutant. We conclude that sthenyo genes act mainly at the phialide stage of conidiation. We also describe the isolation of new medA mutants arising spontaneously as outgrowths on brlA42 colonies.
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