VIEW ARTICLE

Resistance

Development of Puccinia graminis f. sp. tritici on Resistant and Susceptible Barley Cultivars. M. A. Sellam, Postdoctoral Research Fellow, University of Minnesota and Assistant Professor, Department of Plant Pathology, University of Assiut, Assiut, Egypt; Roy D. Wilcoxson, Professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Phytopathology 66:667-668. Accepted for publication 12 January 1976. DOI: 10.1094/Phyto-66-667.

Infection types 3-4 developed on the barley cultivar, Hiproly, inoculated with each of three races of Puccinia graminis f. sp. tritici, and infection type 1 developed on cultivars Larker and Manker. Numbers of uredia per square centimeter of leaf surface were fewer in Larker and Manker than in Hiproly. There were no significant differences between resistant and susceptible cultivars in urediospore germination, appressorium formation, or penetration. Growth of the pathogen was restricted inside the leaves of resistant barley cultivars, but not in those that were susceptible.