Nuclear Behavior in Mycelium of a Solopathogenic Line and in a Cross of Two Haploid Lines of Ustilago maydis (DC.) Cda.

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Abstract
The mycelium of each of the three isolates investigated (solopathogenic line 410qq and haploid lines 10A4 and 17D4) was typically uninucleate in artificial culture. The solopathogen was also characteristically uninucleate throughout its development in the host, and no suggestion of karyogamy was found. Mycelium resulting from the cross of the 2 compatible haploid lines in the host was initially uninucleate. However, a progressive increase in the percentage of dikaryotic cells occurred until 11 days after inoculation at which time the trend reversed and uninucleate cells again predominated. The changes in nuclear condition were interpreted as being due to dikaryotization followed by nuclear unions. Karyogamy occurred prior to recognizable chlamydospore formation. Although a few of the mycelial cells from the cross were multinucleate throughout the course of study, this condition is considered due to mitoses involved in normal mycelial growth.

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