Isozymic Variation in Puccinia graminis f. sp. tritici Detected by Starch-Gel Electrophoresis. J. J. Burdon, Senior Research Scientist, Division of Plant Industry, CSIRO, G.P.O. Box 1600, Canberra, A.C.T. 2601, Australia. A. P. Roelfs, Senior Plant Pathologist, Cereal Rust Laboratory, Agricultural Research Service, USDA, University of Minnesota, St. Paul, MN 55108. Plant Dis. 70:1139-1141. Accepted for publication 14 April 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-1139.

A survey of electrophoretic variation in 65 isolates of Puccinia graminis f. sp. tritici (the causal organism of wheat stem rust) collected in 13 countries detected 13 loci in 10 enzyme systems. Five loci were monomorphic, whereas two, three, or four alleles were detected at the remaining loci. Most alleles were widely distributed. These results are integrated with those of earlier extensive studies of this pathogen in Australia and North America to provide an overall picture of electrophoretic variation in P. g. f. sp. tritici.