Variation amongst isozymes of Rhynchosporium secalis

Mycelial extracts of 288 single‐spore isolates of Rhynchosporium secalis. derived from infected leaves collected from seven barley cultivars at nine sampling sites, were subjected to horizontal slab polyacrylamide gel electrophoresis. A total of 28 patterns for α‐esterase, four for β‐glucosidase and one for β‐galactosidase were obtained. One probable isozyme polymorphism, for α‐esterase, was identified. There was no correlation between any particular band or pattern and either host cultivar or site.