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SUMMARY: A study was made of the morphology and growth of young mycelia of a temperature-sensitive mutant (sepA2) of Aspergillus nidulans. At 25 0C the mutant grew at the same rate as the parental strain, formed septa and branched normally. At 30 and 37 0C the mutant grew at about three-quarters of the rate of the parental strain and, unlike the parental strain, branched dichotomously. The mutant was aseptate at 37 0C, and at 30 0C produced fewer septa than the parental strain. No septal initials were detected in mutant mycelia grown at 37 0C. Aseptate mycelia of the mutant were grown at 37 0C and then transferred to 25 0C. After transfer to 25 0C, septa appeared parasynchronously throughout aseptate regions of the mycelium previously formed at 37 0C. The intercalary compartments formed in this manner had a mean length which was identical with those of intercalary compartments formed by the parental strain at 37 0C or the mutant at 25 0C. The lag between transfer of mutant mycelia from 37 to 25 0C and the first appearance of septa varied from 0.15 to 2.75 h; the maximum lag observed was similar to the organisms's doubling time (2.37 h) at 25 0C.

Morphology and Growth of a Temperature-sensitive Mutant of Aspergillus nidulans which Forms Aseptate Mycelia at Non-permissive Temperatures