Dimorphic and yeast-like mutants of the genusCephalosporium Cda |
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Authors: | E Ji?ínská |
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Institution: | (1) Dairy Industry, Strakonice |
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Abstract: | A series of mutants, in which the mycelial type of growth gradually changes to the dimorphic and permanent yeast-like forms,
were isolated from cultures ofCephalosporium sp. subjected to UV radiation. The intermediate stage between the mycelial and dimorphic strains (mutants 2/29 and 2/R) is
characterized by the absence of aerial hyphae, ability to form conidiophores inside agar and by polymorphism of conidia. The
Y-M transformation of two dimorphic mutants obtained from the 2/R mutant depends on temperature. Another mutant isolated from
the 2/29 strain was found to form the mycelial phase only when osmolarity of the medium increased. At 22°C the transformation
of all three dimorphic strains was influenced by the carbon source: the Y phase predominated in glucose-containing media,
the M phase predominated in media with amino acids or citrate serving as carbon sources. Another mutant (2/7R) was found to
grow permanently in the Y phase and was not influenced by temperature, osmolarity of the medium and by the carbon source.
It is assumed that the dimorphism of the mutants is caused by a conformational mutation inhibiting the apical growth. This
mutation can be phenotypically reversed by some factors of the environment. |
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