A Uninucleate Wheat-infecting Strain of the Stem Rust Fungus Isolated from Axenic Cultures

Abstract

SUMMARY: Four monokaryotic axenic cultures derived from a dikaryotic isolate of Puccinia graminis tritici race 126-ANZ-6, 7 were tested for pathogenicity on wheat leaves. Only two rust cultures were pathogenic, one of which was propagated on wheat for six uredial generations. Cytological examination showed that cells of this culture were uninucleate and apparently haploid. This isolate may have arisen by somatic recombination.