A MUTATION FOR PATHOGENICITY IN PUCCINIA GRAMINIS TRITICI

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Abstract
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.

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