Abstract
The nuclear DNA content of uredospores of a monokaryotic, variant strain of Puccinia graminis f.sp. tritici was determined using Feulgen fluorescence photometry. The relative values obtained when compared with haploid nuclei in uredospores of the parent dikaryotic strain, agree with the proposition that the monokaryotic variant is diploid. Measurements of DNA content also indicated that each nucleus in the abnormally large, binucleate uredospores formed by the variant strain, has twice as much DNA as a haploid nucleus.
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