Barley cultivar discrimination: I. Sodium dodecyl sulfate‐polyacrylamide gel electrophoresis and glycoprotein blotting

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Abstract
Two different methods of detecting electroblotted glycoproteins after sodium dodecyl sulfate‐polyacrylamide gel electrophoresis of Tris‐buffer soluble barley seed proteins were examined for their applicability for barley cultivar discrimination. These are the highly specific, lectin‐based concanavalin A/peroxidase method and the more general periodate/danyslhydrazine method. The results of the periodate/dansylhydrazine method enabled us to divide the 20 examined cultivars into three groups, whereas the more sensitive concanavalin A/peroxidase method revealed six different glycoprotein patterns. In comparison, sodium dodecyl sulfate‐polyacrylamide gel electrophoresis and silver staining of the alcoholsoluble barley seed proteins (hordeins) gave nine different banding patterns. A combination of hordein electrophoresis together with glycoprotein staining by the concanavalin A/peroxidase method made it possible to classify the cultivars into twelve groups, the largest of which contained four cultivars. The qualitative expression of the glycoprotein patterns seemed to be independent of growth conditions, whereas the band intensities obviously were not. As a whole, glycoprotein blotting is a valuable supplement to sodium dodecyl sulfate‐polyacrylamide gel electrophoresis of hordeins in barley cultivar discrimination.