1939/09/01 by Margaret Newton, T. Johnson · 2 citations
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Wheat and Barley Genetics and Pathology #Berry genetics and cultivation research #Yeasts and Rust Fungi Studies #Race (biology) #Puccinia #Pathogenicity #Biology #Mutation #Microbiology #Botany #Horticulture #Genetics #Gene #Mildew
paper · doi:10.1139/cjr39c-027
openalex publication_date 1939/09/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
A pathogenic change, explainable only on the assumption of mutation, has occurred in a uredial culture of race 52 of Puccinia graminis Tritici, which had previously remained constant in pathogenicity for nearly two years. The mutation appears to have taken place during a six-month period of storage of the urediospores in a refrigerator maintained at a temperature of about 8 °C. When cultured in the greenhouse, at the end of this period, the rust appeared to be a mixture of race 52 and a hitherto undescribed physiologic race, with the latter predominating. The original culture was left in storage for a further period of four months, after which it gave rise to a pure culture of the new race without any indication of the presence of race 52. The new race has been assigned the number 178.